Spearhead From Space:
ep 1 -	The newly-regenerated Jon Pertwee gets off to a good start. As he collapses to the ground in his very first scene, he nearly pulls the left-hand TARDIS door off its hinges!
ep 1 -	In Liz's first scene with the Brigadier, the alleged physics and meteorite expert says, "Most meteorites don't even reach the Earth's surface – they usually burn up in the atmosphere." However, the very definition of a meteorite is a meteor that reaches the Earth's surface.
ep 1 -	When the Brigadier says to Liz, "Since UNIT was formed, there have been two attempts to invade this planet", his voice sounds completely unlike Nicholas Courtney's – in fact, it sounds quite a bit like Jon Pertwee! Either the line was overdubbed by someone else for some reason, or something strange happened to the sound on the master recording at that point.
ep 1,2 -	The Doctor supposedly has the TARDIS key tightly clenched in his hand during the kidnap attempt and subsequent shooting. However, he is shown operating the wheelchair with open hands, and he claps his right hand (the one in which he put the key in the hospital) to his forehead on being shot, with no sign of the key being there.
ep 2 -	When the Doctor arrives at UNIT HQ, he blusters his way past the commissionaire (Derrick Sherwin). In the brief shot of him saying the line "And I'm not going to tell you my name, either!" the movement of his lips completely fails to match the words he's saying.
ep 2 -	Immediately after the previous blooper, the commissionaire phones the Brigadier, saying that the visitor hasn't got a pass and won't reveal his name. But on the phone the Brigadier can be heard saying "The Doctor? Send him up!" Does the Brig have Time Lord telepathy?
ep 3 -	When the dog is barking at Sam's house and is abruptly silenced (apparently by an Auton), the sound is obviously not a dog barking. It sounds a bit like a man pretending to be a dog, but whatever it is, the attempt at sounding like a dog is laughable at best.
ep 3 -	When Mrs. Seeley confronts the Auton and it turns to face her, there's a big close-up of it where you can see the actor's right eye blinking behind the Auton mask.
ep 4? -	During one of the scenes at Madame Tussauds, one of the female "waxworks" forgets to remain still: you can see her look up and then look down again.
ep 4 -	The famous montage of the Auton rampage in the high street contains two different shots of people starting to run from the bus stop after the Autons fire on them – first from behind, and then from in front.

The Silurians:
ep 1 -	When Major Baker leaves his security conference with the Brigadier (after the Brig says the Doctor is his personal responsibility), Norman Jones can't get his briefcase to shut properly and has to walk out holding it closed with both hands.
ep 1,2,5 -	In episode 1 Liz's belt is tied to her left, but in episode 2 it's tied to her right. In episode 5, when she has that same outfit on again, the belt's back to being tied to her left.
ep 3 -	When Dr. Quinn turns up at Squire's farm it's raining heavily, unlike all the other outdoor scenes in this episode. In the next scene in the barn, he starts with his jacket soaking wet, up until the Doctor's line, "I understood you weren't feeling too well". From that point onward, Quinn's jacket is suddenly completely dry.
ep 5 -	When the Old Silurian is talking to the Doctor in the control room, the headpiece of his costume is loose, and the piece of white tape (or velcro?) meant to hold it attached to his body is very visible.
ep 5 -	As a Silurian prepares to revive Major Baker in the caves, the actor catches his foot on some kind of cable lying on the floor of the set. Then, when Baker wakes up and moves off, the fiberglass rock on which he was lying wobbles noticeably.
ep 6 -	Another loose Silurian headpiece, this time on the Young Silurian, as he commands the removal of the Old Silurian's body.
ep 6 -	After ranting to Liz about the complaints he intends to make to the Brigadier, Dr. Lawrence brushes past him in the doorway of the conference room without a word!
ep 6 -	The Silurians burst into the cyclotron room and start killing the technicians before the Doctor stops them. As one Silurian turns to face the Doctor, his third eye keeps flashing for an extra few seconds.
ep 7 -	It is explained that the Van Allen belt protects Earth from harmful radiation, but in reality it's the ozone layer that performs this function.
ep 7 -	The Doctor sets the reactor to overload and the Silurians make a dramatic exit – except, where do they walk off to? The only exit from the cyclotron room is by way of the raised outer control room, but the humans watch the Silurians walk away from that. To all appearances they just vanish off the set.

The Ambassadors of Death:
ep 1 -	Watch the scene where Van Lyden is sitting in the spaceship, as viewed on the monitor screen at space control. Van Lyden says "changing attitude of capsule", and the image on the screen rotates. But if the camera was in the spaceship, surely the camera image shouldn't change, since the camera would be attached to the spaceship? (Unless of course the camera was floating outside in space – hardly likely!)
ep 1,7 -	In episode 1, we see a matte shot of the launch control room, which you'll notice has a rather high ceiling. At the very end of episode 7, we see another shot of the same room – but suddenly it has the same roof as the rocket launch site seen in episode 5.
ep 1 -	When the Doctor asks the controller to get Taltalian to cooperate, a screen rises out of the desk with Taltalian's face projected on it. This is obviously done using CSO because later when the screen retracts down into the desk, the image of Taltalian doesn't move with the screen!
ep 2 -	When the Brigadier is about to climb aboard the truck carrying Recovery 7, he supposedly gives orders to the motorcycle outriders. He gestures off-camera and says, "Keep to the prepared route and clear the way ahead of us". However, Nicholas Courtney's eyes are looking completely away from where he's gesturing – clearly there's no-one actually in front of him (except the camera crew). Then he looks behind him and adds, "You bring up the rear" before climbing into the cabin, whereupon the camera shows there's no-one behind him either!
ep 3 -	An alien tosses Reegan into the corner of their storage cell, and the corner pillar of the cell wobbles very badly. Then, Lennox is chased up the stairs by the alien, Reegan is knocked away, the alien starts to collapse and Reegan jumps to get out of his way, bumping into a "brick" wall which also shakes in a most un-brick-like way.
ep 4 -	Listen out for Taltalian's amazing metamorphing accent in his car when he confronts Liz.
ep 4,6 -	The guard (stuntman Max Faulkner) who is killed by the Ambassador at the main gate in episode 4 reappears alive and well in episode 6!
ep 4 -	Quinlan's office safe slips about as the alien tries to open the door.
ep 5 -	At the beginning of this episode, the walls of Quinlan's office seem very flimsy when the UNIT soldier is killed by the alien, and also when the Brigadier rattles the handle of the door which has been fused shut by the alien.
ep 5 -	When Reegan is sabotaging the fuel bay, there is a sign misspelling M3 Variant as "Varient".
ep 7 -	When the Doctor transmits the SOS code, Benton recognises it before he hears the entire message.
ep 7 -	When the Doctor goes up in the rocket to dock with the Mars probe, he tells the space station controller that he can withstand more G-force than normal people, so they can use more M3 fuel to make the trip faster. The controller declines, saying that the risk of the rocket exploding is too great – however, later on when the Doctor is trying to transport the aliens back to their ship on board a rocket, he suggests using pure M3 fuel as the ambassadors will not be affected by G-force. Why is there no more concern about the rocket exploding?
ep ? -	Recovery 7's nose cone changes colour between scenes.

Inferno:
ep 1 -	A rather stylish quick cut, from Harry Slocum about to smash a technician's head in with a wrench to Benton hammering a nail into a wall, is unfortunately marred when the wall wobbles noticeably under Benton's hammer-strokes.
ep 1-7 -	This is a general problem throughout the story: Bessie's wheels are completely clean and dry inside the Doctor's hut, whereas the ground outside is clearly wet and muddy.
ep 1 -	Look at the "Nuclear Power Output" gauge in the TARDIS laboratory: "megavolts" is mis-spelt as "Megga Volts".
ep 2 -	This is a pretty general problem, but it's best illustrated by an instance in Episode 2. The first person to be turned into a monster by the primeval ooze is supposed to be red-hot (as are they all) – in fact, when he dies lying against a wall, the paint is blistered and burnt by the heat from his body. Yet his clothes remain completely undamaged, not even slightly bursting into flame! [I don't suppose the BBC would have tolerated a children's programme containing a bunch of singed, greenish nudists running around menacing the cast...]
ep 3 -	Section Leader Elizabeth Shaw's wig changes noticeably between the exterior and interior scenes.
ep 3 -	During one particular scene in the alternate universe, Professor Stahlman calls Lethbridge-Stewart "Brigadier" instead of "Brigade Leader".
ep 3 -	As the Doctor escapes from the Brigade Leader's office, he runs past one of the control consoles, which is complete with that extra little orange-coloured panel that was used in episodes 1 and 2 to control the flow of power to the Doctor's experiments. What's this thing doing in the parallel universe, since the Doctor doesn't exist there?
ep 3-5 -	Jon Pertwee repeatedly mispronounces "continuum" as "continny-um".
ep 6 -	At the end of this episode, the Doctor's floppy bow tie is untied – but when he rematerialises in our dimension, his tie is, well.... tied!
ep 7 -	The climax to this story, while suspenseful, does leave a little to be desired in terms of credibility. Consider this: The Earth's crust is on average 25 miles thick, and the drilling went on for roughly 60 hours (we see the countdown timer in episode 1). Since the countdown was halted with 35 seconds to go, if we assume a constant drilling rate, that means the drill would have been about 20 feet from breaking through to the Earth's mantle when it was stopped. The problem is – shouldn't the huge pressures which exist in the mantle break through that scant few feet of rock by itself and cause the destruction of the Earth regardless?

Terror of the Autons:
ep 1 -	In his very first scene, how does the Master manage to click his fingers while wearing leather gloves?
ep 1,2 -	The left-hand TARDIS door is ajar for practically the entire story, and there are several shots in the first two episodes where we can see completely inside the police box, revealing all too clearly that it's just an empty shell.
ep 1 -	When the Master hypnotises Jo in Farrell's office, he asks her who went to the radio telescope. Jo replies "Myself, the Brigadier and the Doctor". So what happened to Mike Yates then?
ep 2 -	Jon Pertwee steals Richard Franklin's lines out from under him during the following exchange: Yates: "But I understood that under hypnosis, it was impossible for..." Doctor: "You thought that under hypnosis... [embarrassed pause] it was impossible for a subject to be... [another pause] persuaded to do anything that was against his nature?"
ep 3 -	As the Doctor and Jo run away from the Auton policemen, Katy Manning can be seen to trip over, with a loud "Ooof!".
ep 3 -	When Jo is attacked by the killer doll, we see her jump up from the bench near the window and quickly retreat towards the window. But as she later tells the Doctor, when the doll attacked her she was on the phone – which is on the other side of the room, near the door.
ep 3 -	After shooting the killer doll, Mike Yates tells the Doctor that he went to "fetch some cocoa". The Doctor's reply: "Fetch a tin of what?"

The Mind of Evil:
ep 1 -	As the Doctor takes his seat for the demonstration of the Keller Machine, he tosses his cape half over the man sitting next to him, and has to quickly rearrange it with a muttered apology.
ep 1 -	If Professor Kettering was only killed by his fear of drowning, how did all that water end up in his lungs?
ep 2 -	When Mailer's guards in the cell are playing draughts, they are sitting next to each other in a ludicrous position, so that one of them is playing sideways! [This was obviously arranged purely so that they both have their backs to Mailer and can't see him reaching for the gun beneath his pillow.]
ep 3 -	Jo foils Mailer's first prison takeover attempt by grabbing his gun arm and smashing it over her knee to force him to drop his gun. Evidently this was very painful for Katy Manning, as all through the rest of the scene and the ensuing fight she's clutching her left leg as she tries to act in control of the situation.
ep 3 -	As the Doctor and the Master have a fist-fight in the prison governor's office, they knock over a water carafe, and slip and slide all over the ensuing puddle. [Apparently this was totally unintentional, but was kept in the finished episode because the director thought it looked good.]
ep 4 -	After the Master displays a picture of the Thunderbolt on the projector, he then changes to another slide (displaying a map) before switching it off and leaving. Soon afterwards, the Doctor and Jo come along, and when Jo turns on the projector, it has inexplicably returned to the original slide, showing the Thunderbolt.
ep 5 -	The Master must have been fond of that upright dark grey control panel that can be seen as part of his missile launch control gear – it's the same panel that was used earlier to control the Keller Machine!
ep 6 -	Is the best way to dispose of a nuclear-powered nerve gas missile really to explode it somewhere in south-east England?? (One of the most densely-populated areas in Europe!)

The Claws of Axos:
ep 1 -	As Filer is driving along in his car, listening to the radio, notice that through the window to his right you can see a blue CSO screen which is completely blank – no superimposed backdrop! [This is only the start of what turns out to be a far from exemplary production for the Chromakey operator: see episode 4 below.]
ep 2 -	The Nuton power complex contains a cyclotron which, Winser explains, can accelerate atomic particles to the speed of light and beyond. There's even an instrument which measures the effect, with a scale marked in "X light"! Unfortunately, relativity states that you can't accelerate particles to the speed of light (let alone beyond it), because at that point the particles would have infinite mass.
ep 2 -	As the Master escapes from Axos, he kills the UNIT soldier standing guard outside, whose beret falls off as he slumps to the ground. Cut to the Master standing over the corpse, and the missing beret instantly replaces itself on poor Private No-Name's lifeless cranium.
ep 2 -	Just as the Brigadier, Jo and Filer escape from the room where the army have been holding them captive, the wall of the room sways outwards (the way that a flimsy wooden wall usually does when someone leans on it).
ep 3 -	At the start of this episode, as the Axon creatures attack the nuclear lab, look out for some sloppy continuity. Just after Filer gets impaled on a tentacle and the creatures advance on our heroes, Jo is clearly standing behind the Doctor's arm. We cut briefly to a second shot (as the Axons say "repersonalise") and Jo is standing directly alongside the Doc. And finally we cut to a third shot (just before the creatures morph back into "golden girls") and Jo is plainly standing a yard in front of the Doctor.
ep 3 -	It's amazing how Sergeant Benton can keep a straight face when reporting to the Master, who is wearing the saggiest, least convincing rubber-General-disguise-mask you're ever likely to see!
ep 4 -	As the Doctor and Jo escape from Axos, Jon Pertwee trips and falls flat on his face!
ep 4 -	CSO incompetence strikes again when the Axons attack the UNIT jeep containing Benton and Yates. There are several prolonged and painfully obvious shots showing a blank blue Chromakey backdrop through the jeep's windows, with no effects superimposed. [Was the CSO operator out sick that week or what?]
ep 4 -	During the scene in the TARDIS where the Doctor offers the Master an alliance, the left-hand TARDIS door refuses to close properly. Then, when the Doctor goes to leave, despite the fact that neither he nor the Master touches the console, the right-hand door obligingly swings open for him!
ep 4 -	During the climactic gun battle in the Nuton lab, the TARDIS is briefly visible in the background, although the Doctor and Master left in the TARDIS some minutes earlier.
ep 3,4 -	In this story, the Nuton Complex is a giant nuclear power plant which supplies the whole of Britain with electricity. In episode 3, Hardiman understandably claims that if the reactor were to explode, thousands of lives would go with it, as the chain reaction would turn the station into a gigantic nuclear bomb. When exactly this event happens at the end of episode 4, not only does the reactor explode without apparent loss of life, but the Brigadier and co. calmly return to the scene of the explosion within seconds!

Colony in Space:
ep 1,6 -	When the Brigadier walks to where the TARDIS has dematerialised from and tells it to "come back at once", luckily for him it reappears in a different corner of the room!
ep 1 -	Jon Pertwee has pronunciation problems again: "We're outside the space/time continny-um." [See Inferno]
ep 1 -	The TARDIS doors are wide open when the Doctor and Jo leave to go exploring, but they're slightly ajar when the primitive is sneaking around a minute later. Then when the group of primitives tip over the TARDIS and drag it away, the doors are completely shut! [Clearly the Doctor installed some kind of Gallifreyan anti-theft device... though that didn't stop the TARDIS itself getting stolen!]
ep 1 -	The story is set in the year 2472, but at one point, Mary Ashe says that the colonists left Earth "back in '71". Odd thing to say, considering "'71" was only a year ago – why didn't she just say "we left last year"? [Obviously Malcolm Hulke wanted Jo to confuse 1971 and 2471 so he could establish the year the story's set in.]
ep 1 -	In the Leesons' dome, we see a wall calendar with the date Monday, 2 Mar 2472. Well, the production team only had a 1-in-7 chance to get it right, so we can't blame them too much for guessing wrong – 2nd March 2472 will actually be a Wednesday. [Barring radical changes to the calendar system in the meantime!]
ep 1 -	When the Doctor tells Winton, "Whatever you saw can be destroyed", there are a few frames missing, causing two of the colonists moving in the background to abruptly change positions.
ep 2 -	When the Doctor meets Caldwell (the moustached IMC surveyor) at the start of episode 2, he persuades the Doc to accompany him back to his ship. Whereupon they both head towards the IMC "jeep" waiting outside, and without a word from either of them, Pertwee gets into the driver's seat and they drive off. But think about it for a moment – Caldwell and the Doctor have only just met, and the jeep belongs to IMC. Why is the Doctor doing the driving?
ep 2 -	As the IMC crew watch the Doctor and Caldwell drive towards their ship, Morgan remarks "Look, Caldwell's found us a colonist – I wonder why he's wearing fancy dress?" (referring to the Doctor's attire). But over his shoulder, we can see the monitor he's looking at while he says this, and the jeep is still way off in the distance – it's tiny! How on earth can he see what the Doctor is wearing?
ep 2 -	Watch out for some minor CSO goofs – there are at least two brief occasions on board the IMC ship when a blank blue screen appears in the background instead of the ship's monitor. One is when Caldwell, Morgan and Captain Dent are arguing about the accidental death of the two colonists, and the other is several minutes later when Morgan and Dent are discussing the identity of the Doctor.
ep 3,5 -	One of the IMC crew members (played by Pat Gorman) seemingly undergoes a rapid lifestyle change, as he grows a moustache and becomes a colonist within the space of two episodes! In episode 3, he's the IMC crewman that Captain Dent tells to "close down all systems" after the IMC ship lands. Later, in episode 5, he's the colonist that Winton tells to escort the Adjudicator back to his ship.
ep 3 -	As Winton is chased by the IMC guards to Caldwell's camp, his face and hair get covered with dust and grime. In the next scene, inside Caldwell's tent, they are suddenly clean again.
ep 5 -	When the Master spots the Doctor and Jo sneaking around in his TARDIS, he knocks them out with what he later describes as "a simple sleep gas". Afterwards, he adds "Mind you, I could just as easily have used a lethal one". So why didn't he? He was all set to kill the Doctor a little while earlier (at the end of episode 4), and he only found out about the Doctor's usefulness (his knowledge of the primitive city) after he released the gas!
ep 5? -	At one stage, the Master forces the Doctor to try and open the door to the Primitive City, when he finds the IMC are trying to rescue Jo. As he's about to release the poison gas, the Doctor kicks him, knocking the laser gun and the control out of his hand. They are then surrounded by Primitives, who take them inside the city, leaving the laser gun outside. Later, when they escape from the room with the frieze, the Master has his gun again.

The Daemons:
ep 1 -	As the Doctor demonstrates Bessie's new ability to drive around by herself, watch her as she completes the loop out in front of the garage and starts to drive offscreen: you can spot the face of the stunt driver scrunched down in the front seat.
ep 1 -	It's practically impossible for the wind to cause a road sign to spin around. Think about it: the only way a sign would spin around like that would be if the forces exerted on the left and right sides were coming from opposite directions – which could only happen if the sign was in the centre of a tornado! [In reality, strong wind would probably just knock the sign over.]
ep 1 -	During the scene where Miss Hawthorne exorcises the winds, her clothes rearrange themselves between shots.
ep 1,2 -	Jo and the Doctor try to make their way up to Devil's End at night, but their path is blocked by a tree, so they both decide to get out of Bessie and continue on foot. Notice that they leave Bessie's headlights on. Later, when the Doctor goes back to collect Bessie, her headlights are off, and moreover, her engine starts instantly – no hint of a flat battery!
ep 2 -	Garvin's shotgun gets broken in two during his struggle with Benton in the cavern and he has to use both hands to hold it together.
ep 2,3 -	When the van (milk float?) crashes into the signpost and bursts into flames because of the heat barrier, the signpost clearly says 'Devils End 1' (i.e. one mile). In the next episode though, we hear it explained that the heat barrier supposedly has a five mile radius centred on the village church.
ep 3 -	The Doctor mispronounces "Daemons" as "day-mons" on two different occasions in this episode, but refers to them correctly as "dee-mons" the rest of the time.
ep 4 -	At the beginning of the episode, after the Master shouts "Go back to the mark!" we cut away to the Doctor and the Brigadier at the heat barrier. However, the Master's voice can still be heard for a few seconds (shouting "Go back!") on the soundtrack.
ep 4 -	During the ceremony where the Master summons Azal for the last time, there is a wide shot of the cavern, and you can see something white (probably a clipboard held by a crew member) appear briefly in the bottom-right corner of the picture.
ep 4,5 -	Just before Azal appears, look behind the Master's left shoulder and play spot-the-crew-member.
ep 4,5 -	In episode 4 the energy exchanger interferes with radio communication, but by episode 5 it has conveniently lost this annoying side-effect.

Day of the Daleks:
ep 1 -	While the Doctor is pottering around in the TARDIS trying to get it working, he hands a clipboard and pen to Jo. As he does so, the pen falls off the board and gets stuck about halfway down the TARDIS console where it stays for the next couple of shots. But then Jo hands the clipboard back to the Doctor with the pen, and no sign of her having bent over to retrieve the errant writing implement.
ep 1 -	Early on in this episode, the Brigadier gets a phone call. When he answers, we can hear the muffled voice of a male secretary of some sort announcing that he has the Minister on the line for the Brig. The secretary finishes his line, then the Minister says "hello" in the middle of the Brig's reponse. The Minister then offers a second "hello", but Nick Courtney doesn't seem to react until the third one.
ep 1 -	The Brigadier tells Jo that Auderley House is a government-owned country house. But all other indications in the story are that Auderley is Styles's private home (e.g. Styles's wine cellar, the fact that the Brigadier asks Styles for permission to search the grounds, etc.).
ep 1 -	As Styles enters his study when the Doctor and co. are talking to Miss Paget, the camera is a little too high, and a diagonal wire can be seen attached to the chandelier. [This is known as a "braille wire", used by the studio lighting crew to control the chandelier's position in the set – since sets don't normally have ceilings, a chandelier has to be suspended from the studio's lighting rigs.]
ep 1 -	Watch the Brigadier slip and slide as he's running through the mud on his way to the railway tunnel. Hilarious!
ep 1 -	When the controller contacts his masters for the first time, the camera zooms back dramatically to show who he's reporting to: the Daleks! In awe of seeing them for the first time, the boom operator has forgotten to move out of the way and the boom mike can be seen sitting above the controller's head rather sheepishly.
ep 2,3 -	When Styles's house is being attacked by the Ogrons (in studio), the freedom fighter Boaz loses his hat while running out to fight. In the next shot (on location) he has it back on. Then in the next episode, when the Doctor catches up with them in the tunnel, it's gone again.
ep 4 -	As the attack force of Daleks and Ogrons emerges from the tunnel, one of the Ogrons has a very badly-fitting mask – a large portion of the actor's face can be seen underneath it.

The Curse of Peladon:
ep 1 -	The king says that the reason the chairman delegate has not yet arrived is that Earth is "many light-years" away from Peladon, and Alpha Centauri agrees, calling it "a remote and unattractive planet". Rather odd, since Alpha Centauri is in fact the nearest star to our Solar System, being only 4.3 light-years away from us. (Arcturus, by contrast, is about 37 light-years from Earth.) Besides, the Ice Warriors have already arrived, and they're from Mars, which is right next door – why should it take any longer to come from Earth?
ep 2 -	As Jo walks along the castle ledge to escape from the Ice Warriors' room, we'll gloss over the fact that the "stone" wall behind her wobbles like a thin wooden panel (surprise, surprise) and mention something else instead: at one point, there's a quick shot of a piece of the ledge breaking off under Jo's shoe and falling down the cliff face. The only problem is that the shoe isn't Jo's! If you look closely, you'll see that the shoe in that brief shot is more pointed and of a darker colour than the shoes Jo is wearing, and has a strap across the ankle instead of being a slip-on. [Perhaps the director found a piece of stock footage to use for this dramatic moment, hoping no-one would notice the mismatch. Ha!]
ep 2 -	Immediately after the previous blooper, when Jo gets back inside the castle, her hair, which had been blown about by the wind outside, is suddenly all nice and neat again.
ep 3 -	When the Doctor goes through one of the secret doors leading down below the palace, watch the door as it closes behind him: overhead you can see the string which was used to pull the door open in the first place.
ep 3,4 -	On several occasions the Doctor's spinning mirror directly reflects the studio lights, rather undermining the desired impression of a barbaric citadel lit only by flaming torches.
ep 4 -	When Aggedor attacks Hepesh, the Doctor tries to calm the beast with the hypnotic spinning wheel. Unfortunately, he misses the wheel at one point and it stops spinning – luckily Aggedor doesn't seem to notice.

The Sea Devils:
ep 1,5 -	When the Doctor looks through a pair of binoculars at the castle in episode 1, the close-up of the castle is surrounded by a circular mask to indicate we are seeing it through the binoculars. But in episode 5 when the Admiral commanding the naval task force looks through his binoculars at the Sea Devil bodies floating in the water, we see them surrounded by a sideways-figure-of-8 mask instead.
ep 1 -	When Jo and the Doctor are climbing the ladder to get into the sea-fort, it's painfully obvious that it's not Katy Manning, but a cross-dressing stuntman wearing a Jo Grant wig.
ep 2 -	When the Doctor and Jo are carrying the fat guy out, for a split-second before the Sea Devil appears you can see shadows and light moving around in the background as if there's someone there. [Which there undoubtedly is!]
ep 2 -	While in the sea-fort, the Doctor rigs up the radio to transmit messages, but somehow still gets it to receive messages too. Handy, that.
ep 2 -	The radio that the Doctor built has a fatal flaw – if you look closely at the device (this is easiest to see right before it explodes), you can see that there's a 9-volt battery clip sticking out of it. But there isn't a battery in the socket, so the whole device shouldn't be able to work at all because there isn't a complete circuit. [Somehow I doubt that the Doctor would let a small detail like that stop him.]
ep 2 -	The helicopter sent to rescue the Doctor and Jo acquires a new paint job in mid-flight.
ep 2,3 -	The clock on the wall in the Master's quarters causes a couple of continuity problems. When the Master pulls a gun on the Doctor and the Doctor quickly pulls the door shut, the clock shows ten minutes to three. In the next episode, after the swordfight is over and the Doctor is being led out by the guards, the clock now shows approximately eight minutes after twelve!
ep 3 -	A more subtle clock problem: when the Doctor is brought into the Master's quarters and handcuffed to the chair, the clock shows five minutes to one. Less than two minutes later (still in the same scene, with no cutaways), as the Master tells the Doctor he intends to contact "our reptile friends", the clock can be seen showing exactly one o'clock.
ep 3 -	Jo leaves her handbag behind in the prison while rescuing the Doctor, but suddenly reacquires it later without any explanation.
ep 3 -	When the Master arrives at the lifebelt post, the rope is surprisingly slack, considering that the Doctor is using it to climb down the cliff.
ep 4 -	At the naval base, the search for the missing sub is called off because of night approaching. Then the sub is picked up on radar approaching the castle. We see that it's getting dark when the Sea Devils arrive at the castle and rescue the Master. Then, just a few scenes later, Captain Hart and the others are still watching the radar screen as the sub is disappearing again, and Hart says they can resume searching in that area as "it'll be light soon". And indeed, a few minutes later they arrive at the castle, and it's daylight. Where did the night vanish to? [Or did the Doctor and co. spend all night standing there watching the radar screen?]
ep 4,5 -	When the diving bell is raised, you can see drops of water on the camera lens which change position radically between shots, betraying the fact that the finished scene was edited down from a much longer sequence.
ep 6 -	When the Doctor turns on the sonar device (causing the Sea Devils to writhe around in pain), the Master just stands there for over a minute watching a Sea Devil throwing a fit in front of him – long enough for Jo and Captain Hart to escape to the hovercraft – before saying "What are you doing?!" and turning it off!

The Mutants:
ep 1 -	After the mysterious package arrives, the Doctor tells Jo "I couldn't open it even if I wanted to" twice in the same speech.
ep 2 -	As the Administrator comes in to talk to the Doctor, there's a very loud creaking noise from somewhere on the set.
ep 2 -	When Ky and Jo dematerialise in the transmat booth on Skybase, Ky is holding Jo in front of him. But when they rematerialise on Solos, they are facing each other, talking. [This kind of mismatch happens several other times in the story, too.]
ep 2 -	Just after the Doctor stops Stubbs from shooting Varan in the herbarium, a boom mike drops into view in the top-left corner of the picture for several seconds.
ep 3 -	During a "firestorm" on Solos, we see Skybase being hit by flaming debris. But Skybase is in orbit around Solos, completely above the atmosphere where the firestorm is. (If any atmospheric storm were powerful enough to throw stuff into orbit, it would make the planet completely uninhabitable!)
ep 4 -	On several occasions, the movement of the cloaks worn by Varan's warriors reveals that their "Mutt" vertebrae are simply stuck onto their cloaks, not attached to their bodies.
ep 4 -	The ending of this episode defies belief. A hole in Skybase the size of the one Varan gets sucked out of should have caused a violent, almost-immediate depressurisation of the whole of Skybase. Yet Jo and the others can scramble their way to safety with just a slight breeze ruffling their hair – and the Marshal, despite being right next to the hole, manages to get out before them!

The Time Monster:
ep 1 -	During the story, the Doctor gives Jo a "TARDIS sniffer-outer". If you watch Jo's hand whenever it is "on" you can see her finger on a button turning it on and off.
ep 1,2 -	The end of episode 1 has the shots in a different order to the reprise in episode 2, in order for it to end on the dramatic close-up of the Master shouting "Come, Kronos! Come!" However, this causes an amusing error – after the shot of Stuart Hyde clutching his head and reeling back from the crystal, in the next shot (the final shot of episode 1) he can be seen in the background still calmly leaning over the crystal, holding his clipboard.
ep 2 -	When Jo rings the lab to say that Stuart is waking up, Benton answers the phone. He covers the mouthpiece of the phone with his hand while informing the Doctor, who says to tell Jo that he and Ruth are on their way. When Benton goes to report this, Jo says, "It's all right, I heard". But if Benton was covering the mouthpiece, how could she have heard?
ep 2,3 -	When Krasis vanishes from Atlantis, summoned by the Master, the glowing crystal can still be seen in front of Hippias, who is watching. Yet in episode 3, Hippias tells King Dalios that Krasis and the crystal vanished together.
ep 3 -	As the Master summons Krasis, he tells Dr. Percival, "You watch that crystal!" The camera obligingly zooms in on the crystal, and we see that it is uncovered at this point. Immediately after Krasis has materialised, the very next shot reveals that the plastic cover has somehow replaced itself over the crystal.
ep 3,4 -	The Master goes through all the rigmarole of trying to convince Krasis that the crystal is safe to touch, because (he says) he needs Krasis's help to carry the unit containing the crystal. But after making us suffer through all that horrible padding with the Doctor's stupid kitchen-utensil jamming thingy, the Master simply picks the unit up and carries it into the main lab himself! Then in episode 4, he carries it into his TARDIS, again by himself. Grrr...
ep 3 -	Why does the UNIT/Roundheads battle last so long, and with no casualties?
ep 3,5 -	In episode 3 when Dalios showed Hippias the entrance to the Minotaur's lair, the door opens outwards on the left-hand side. When Jo is thrown into the lair by Krasis in episode 5, the door opens inwards on the right-hand side (from the point-of-view of someone outside)! You can look at the statue next to the door to confirm that the same scenery flat has been used as both the inside and outside of the labyrinth door.
ep 4 -	The stock V1 footage is on black-and-white film.
ep 4 -	If the V1 was brought forward in time and exploded in the present day, how come the Comic Yokel remembers it exploding in 1944?
ep 4 -	Helping the soldiers to get the TARDIS upright, the Comic Yokel yells, "One, two, six, heave! One, two, six, heave!" [Perhaps this is supposed to be a piece of Comic Yokel humour..?]
ep 4 -	When the Doctor supposedly talks "backwards", if you actually play what he says backwards, it's still gibberish.
ep 5 -	You can see the stick holding the TARDIS in the scene where the Master throws it into the time vortex.
ep 5,6 -	In the high shot of the console room while Jo is talking to the Doctor out in the vortex, there's a blatantly obvious white electrical cable (presumably used to power the various gizmos on the console) running from the console across the floor and out through a gap between two of the walls. It can also be seen in the TARDIS scenes in episode 6 – in both the Doctor's and the Master's TARDIS.
ep 6 -	In her struggle to reach the Time Ram control, Jo pushes the entire console of the Master's TARDIS out of position.

The Three Doctors:
ep 1 -	Dr. Tyler starts to unscrew the top of his instrument package, and before he can finish undoing a single screw, he gets zapped by the anti-matter blob. Immediately after he vanishes, though, we see the lid of the package completely off and lying loose on top of the box, so that the anti-matter blob can emerge. How convenient.
ep 1 -	Despite the Brigadier claiming that UNIT HQ is a "top-secret establishment", it boasts a large sign outside telling the world not only the function of the building, but the name of the commanding officer!
ep 1,2 -	The Doctor drives Bessie into the UNIT garage, with Jo holding a large umbrella over them. She folds it up and puts it on the floor in the back of the car. Bessie then gets zapped by the anti-matter and disappears. But in episode 2 when they find Bessie in anti-land and drive off, the umbrella is nowhere to be seen.
ep 1-4 -	Whenever the scanner is used, it shows a picture of the lab with the TARDIS in one corner. But if the scanner is mounted on the TARDIS, how can the TARDIS be in the picture?
ep 1-4 -	Several scenes take place in the Doctor's lab with the big chunk hewn out of it. Toward the end of episode 4 it is especially clear that the jagged wall is styrofoam. Props are often made with styrofoam, but it's usually not left a glaring white!
ep 1 -	The Second Doctor's recorder can be seen sitting on the console before it supposedly "materialises" and is noticed by the Third Doctor.
ep 2 -	Bessie was supposedly transported into anti-land, but when you first see it sitting there, it has dust all over the tyres as if it had just been driven to its destination.
ep 2,4 -	You can see the reflections of some camera crew in the monitor used to display the First Doctor.
ep 2-4 -	When Omega is looking at his "magic screen", you can see the outline of the actual television set at the edge of the image.
ep 2 -	Dr. Tyler tries to escape from Omega's palace, and runs into a Gell Guard that turns to face him, then comes after him. In his haste to get away, he grabs the wall, causing it to wobble noticeably. After he's gone, the Gell Guard then walks straight into the wall!
ep 2 -	After UNIT HQ disappears, you can see grass where it used to be. But how can grass grow underneath a building?
ep 3,4? -	When UNIT HQ lands on the antimatter planet, the Brig opens the door to see a still photo of a desert CSOed into the scene. Later, when the Doctors and co are trying to get out of Omega's stronghold through the big doors, you can see the exact same CSO shot of the desert outside. I guess that the BBC's library of clip photography isn't big enough to hold two different desert shots...
ep 3 -	When the second Doctor, the Brigadier and Benton emerge from the TARDIS, the doors are left completely open with the camera looking straight into them for ages, revealing not only the emptiness of the police box shell, but also that there's a pair of secret doors on the opposite side! [These come in handy during episode 4, allowing seven people to come out of the police box in the final confrontation with Omega!]
ep 3,4 -	At various times, you can see actor Stephen Thorne's lips through Omega's mask (and in one profile shot you can also see his jaw), yet when his mask is removed, we find that Omega has been dissipated and has no face.
ep 3 -	The Time Lord President asks the first Doctor to go into the black hole, saying "All three are needed to defeat Omega." Considering that earlier the Time Lords had no idea who or what was attacking them, how did the President learn the identity of the enemy?
ep 3,4 -	When the Brigadier and co. arrive back at UNIT HQ in episode 4, the TARDIS doors that were left gaping open in the previous episode are now closed and locked!
ep 4? -	As the doors of Omega's stronghold are being pulled open, you can see that the exterior of the doors is smooth and gold-coloured. All of the exterior shots show the doors as being gold, but covered with a rocky texture!
ep 4 -	When the companions are returning to Earth via the pillar of smoke, you can see and hear each person walk up the stairs and then supposedly disappear. Unfortunately, you can then clearly hear them walk down the other side!

Carnival of Monsters:
ep 1 -	As Jo sneaks across the room to retrieve the "Illustrated London News" (while Major Daly is asleep), you can clearly hear the sound of a pen being dropped in the background.
ep 1 -	After the Doctor and Jo are locked up in the cabin, they notice a calendar for "June 1926", telling them that today is Tuesday 4th. Only problem is that 4th June 1926 was a Friday! [Maybe this was a subtle and clever clue to tell them that they weren't really on Earth??]
ep 1 -	When Shirna attempts to impress the officials with a little impromptu tapdance, a cable running from the Scope to the back of the set can be seen on the floor behind her. (It's also visible on a couple of later occasions.)
ep 1,2 -	During the cliffhanger, the Doctor leaves the TARDIS door wide open when Jo screams for help, but an instant later, when Vorg's hand lifts the TARDIS out of the hold (and later when the TARDIS is taken out of the Scope entirely) the doors are firmly closed.
ep 3 -	Jo gets stuck in muddy water up to her waist in the marsh, but when they escape back into the Scope circuitry, her trousers are back to being dry and clean.
ep 4 -	The Doctor is specifically told that Vorg is in charge of the scope, but clearly wasn't paying attention, as he later asks if Vorg is in charge.

Frontier in Space:
ep 1 -	Get your finger on the Pause button to spot an editing blunder: Between the pilot saying "They'll be through any minute!" and the next shot of the Doctor fiddling with his sonic screwdriver is a single frame of the airlock door being melted by the Ogrons' cutting device.
ep 1 -	As the Doctor is working on the cell door, just before Jo says "How's it going?", in the shiny surface of the door you can see the blurred reflection of a crew member, who quickly scurries out of shot.
ep 1 -	Immediately after the previous blooper, the next shot is a low angle of the outside of the door looking up, and one of the studio lights is plainly visible in the middle of the picture. [Perhaps they hoped to pass it off as one of the ship's own lights?]
ep 1 -	Look for another editing goof as the Doctor opens the door and discovers the pilot waiting outside: there's a single completely black frame between the shot from behind the Doctor as he opens the door, and the next one, from in front of him.
ep 2 -	An error in the credits for this episode results in Roy Pattison (Draconian Space Pilot) and Louis Mahoney (Newscaster) being credited, although they only appeared in episode 1, and Lawrence Davidson (Draconian First Secretary) and Timothy Craven (Cell Guard) not being credited, even though they did appear in this episode.
ep 3 -	During the last of the "kidnapping attempts", the Doctor and Jo run away from the Ogrons. The Doc dives behind a small wall, when Jo arrives behind him and bends over to hide behind the wall, in the process badly ripping the seat of her trousers apart at the seam.
ep 3 -	Jo seems to change her outfit between episodes – while being held in the prison cell!
ep 4 -	During the Doctor's spacewalk, he pulls an oxygen tube from his spacesuit. Not only does his suit not depressurise as you might expect, but the thrust from it conveniently pushes him in only one direction – towards the airlock!
ep 4 -	The Doctor's banging on the airlock door with his oxygen cylinder causes the entire wall to shake.
ep 4 -	After the Doctor's spacewalk, you can see a production assistant waiting to help Jon Pertwee back into the hatch.
ep 4 -	While the Doctor is planning his escape with a pair of fellow prisoners on the moonbase, watch out for a pony-tailed woman sipping from a "futuristic" cup (in reality a baby-sipper-cup thingy)... then watch her almost choke as something clearly goes down the wrong way!
ep 4 -	While Jo is reciting "Mary had a little lamb" to keep from getting hypnotized by the Master, she says the third line as: "... and wherever Mary lamb, the lamb was sure to go".
ep 5 -	As the Master leads Jo by the hand across the rock-strewn ground of the Ogrons' planet, he can be heard quietly saying various un-Master-esque things like, "Be careful down here." [This is not so much the Master helping Jo as Roger Delgado helping out Katy Manning, whose poor eyesight (without her glasses) left her prone to tripping up on uneven terrain.]
ep 6 -	When the Doctor goes out to repair the spacecraft (the exterior of which suspiciously resembles the one in ep 2), look out for the all-too-obvious strings holding him up.
ep 6 -	When we see model shots of the full spacecraft, it's very hard to believe that the full-sized squarish-looking interior set could be present anywhere inside the (cylindrical) ship.
ep 6? -	Watch out for when Roger Delgado has to give a Dalek a push in the right direction, smirking as he does so.

Planet of the Daleks:
ep 1 -	In the very first scene, Jo is holding a gun in her right hand as she opens the TARDIS doors for the Doctor. But when they come into the console room, she is using both hands to support the Doctor and the gun has mysteriously vanished.
ep 1 -	After the Doctor recovers from his 'coma', he gets up and stands at the console. If you watch the central column at this point, you can see (in one of the mirrored surfaces) a reflection of one of the production crew moving around.
ep 1 -	While the Doctor is trapped in the TARDIS with the air supply running out, why does he take time to change his clothes?
ep 1,6 -	When the Thals rescue the Doctor, the TARDIS doors are left gaping open. But somehow the console manages to remain fungus-free when the Doctor and Jo get back at the end of the story.
ep 1,2 -	During the episode 1 cliffhanger, when the Doctor and Taron spray paint onto the invisible Dalek to make it visible, the Dalek that emerges is multicoloured – not one colour as would be expected from using a single can of spraypaint! Though at the start of episode 2 the Dalek has changed colour to a more understandable dull black.
ep 2,4,5 -	The pots of the "exotic Spiridon jungle plants" are clearly visible in several shots. The most prominent are: when Codal gets captured by the Spiridon patrol (episode 2); when the Doctor is led away by the Daleks after they've destroyed the Thal spaceship (episode 2); two of them visible behind Jo as she gets up after the group decide to move to the Plain of Stones (episode 4); and when Vaber is killed by the Daleks (episode 5).
ep 2 -	As the Doctor is being escorted out of the lift in the underground complex, one of the Daleks bumps into the door frame with an audible 'thunk' as as it passes through.
ep 2 -	When Wester the (supposedly invisible) Spiridon is treating Jo's infected arm, on the ground you can see the (very un-invisible) shadow of whoever's actually holding the bowl.
ep 2 -	When the Doctor sees the Daleks about to destroy the Thal ship, he tells the Thals "Jo Grant's in there!". Fair enough. the Thals already knew that... but how did the Doctor know?
ep 3 -	When Jo climbs out of the crate in the Dalek control room, there's a motionless Dalek in the corner whose eyestalk is pointing straight at her, but conveniently manages not to see her!
ep 4 -	The rock that hits Jo on the head is so large it should have crushed her skull like a grape, or at least caused major concussion. Also notice that Katy Manning obviously knows she's going to be zonked on the head, and blinks uncontrollably just before it strikes.
ep 4 -	When the Doctor and co. escape up the shaft with the aid of a giant hanky, the Dalek sent after them has a blatantly obvious string attached to its top.
ep 4 -	When the Doctor and the Thals finally get to the top of the ventilation shaft, Jo and one of the Thals struggle with obviously polystyrene boulders.
ep 4 -	As the Daleks are discussing their plan to release bacteria into the atmosphere, look for the reflection of a crew member in the glass box containing the bacteria. He or she can be seen moving to and fro several times.
ep 4 -