Time and the Rani:
ep 1 -	In the regeneration sequence, as Urak moves towards the unconscious Doctor, some scraps of his hair can be seen already on the TARDIS floor – obviously left over from a rehearsal or a previous take.
ep 1 -	When the Rani injects the Doctor with an amnesia-inducing drug, the needle is quite obviously just retracting into the handle of the device.
ep 1 -	The Rani was watching when Mel inadvertently scared Sarn into into the bubble-trap. However, later on she instructs Urak to get the unconscious Mel from the TARDIS, despite the fact that she should have known Mel wasn't in the TARDIS anymore.
ep 1 -	The Doctor and "Mel" find the TARDIS door closed and locked, despite the fact that it was open when Ikona found it, and it's rather unlikely he closed it on the way out, being occupied with carrying the real Mel.
ep 1 -	How can the TARDIS scanner show a view through Urak's eyes, especially since the Rani doesn't appear to make any adjustments to the controls?
ep 2 -	The "scientific" technobabble in this story gets steadily more and more insulting, from the Doctor's early blatherings about "strange matter" to his ludicrous statement that "if that asteroid exploded, it would set off a blast of gamma rays equivalent to a supernova", but the worst example (before the Technobabble Hell of part 4) is the Doctor's "I broke the second law of thermodynamics". The idea that a fundamental law of the universe could be violated imply by using the wrong kind of plastic in an experiment (!) is laughable even for Pip and Jane Baker.
ep 2-4 -	Watch Mel's shoes as they repeatedly swap between dirty and muddy on location to bright and clean in the studio scenes.
ep 2-4 -	Since the Tetraps have eyes on the front, back and sides of their heads, why do they have to turn their heads when looking for something?
ep 4 -	It's brain-curdling technobabble time as the Rani's "cunning plan" is finally revealed: "In the aftermath of the explosion, helium-2 will fuse with the upper zones of the Lakertyan atmosphere to form a shell of chronons... In the same milliseconds as the chronon shell is being formed, the hot-house effect of the gamma rays will cause the primate cortex of the brain to go into chain reaction, multiplying until the gap between shell and planet is filled." Ble-arggh!
ep 4 -	How is a piece of fibre-optic cable supposed to complete an electrical circuit?

Paradise Towers:
ep 1-4 -	The elevators in Paradise Towers commit an error common in television programs that use lifts: the lift door is depicted as just a single sliding door. In reality, lift doors are always double – an outer door on each floor, and an inner door which belongs to the lift compartment itself.
ep 1 -	The cake Mel is eating suddenly vanishes when Pex bursts into Tilda and Tabby's apartment. We see her put her cup and saucer down, and move as if to put the cake on the table, but in the next shot there's simply a completely empty plate sitting on the table...
ep 2 -	The Doctor twice states that the coins he finds bear the inscription "Issued by the Great Architect, Kroagnon". However, when we see a close-up of one, it simply reads "Issued by Kroagnon".
ep 3 -	When Tilda throws a knife at Pex, the string holding it up is painfully visible.
ep 3 -	The cleaner carrying Tilda's body to the basement bumps the wall slightly as it goes through the door.
ep 3 -	In Tilda and Tabby's apartment, Mel tells Pex they are on floor 109. Yet, as we saw earlier, the number of the apartment (on the wall outside) is 1236. It would be very unusual (not to mention confusing for the inhabitants) for a high-rise building not to incorporate the level number into the apartment number.
ep 3 -	On a similar note, when Mel and Pex get into the lift, the indicator initially reads 48 – hard to believe they climbed down over sixty floors from Tilda and Tabby's apartment before thinking to use a lift instead!
ep 4 -	When she is attacked by the pool cleaner robot, Mel (or rather her stunt double) is completely submerged underwater at least three times. Yet in the intercut reaction shots of Bonnie Langford, and when she's talking to Pex after the attack, most of her hair is still dry.

Delta and the Bannermen:
ep 1 -	Watch out for the rubber bodies lying on the ground during the battle scene.
ep 1 -	Why would a US satellite launch be "history in the making" in 1959? The first American satellite to reach orbit (Explorer I) was launched in early 1958.
ep 2,3 -	When the Doctor, Ray, Billy and Delta are escaping from Gavrok, look closely at the shots of the Doctor behind Ray to see that he is wearing glasses, as the light reflects off them every now and then. But he wasn't wearing glasses beforehand, and they disappear the instant he gets off. (The same happens later on when the Doctor is driving through the fields with Mel and Burton after the tracking device has been attached to the bike.)
ep 2,3 -	Thanks to some slack editing of the cliffhanger, the Doctor, Mel and Burton are seen to freeze in place for no apparent reason, just before we see the Bannermen line up and aim their guns at them.
ep 3 -	The swarm of "bees" attacking Gavrok and his men look nothing like real bees, being far too large when they approach the camera's position. [In fact, stock footage of a locust swarm was used.]
ep 3 -	Why doesn't the exploding sonic cone destroy everyone, as the Doctor earlier said it would?

Dragonfire:
ep 1 -	When Belazs pushes a button, the whole console strains under the pressure.
ep 1 -	When Kane lays his coin on the control panel, you can see the plywood grain of the "metal" console.
ep 1,2 -	At several points in the story, the "crystalline" walls in the ice caves billow to reveal that they're nothing more than sheets of polythene. An example occurs in episode 1, when Ace and Mel are escaping from Kane. It also happens in episode 2, when Mel throws Nitro-9 at the "zombies".
ep 1,2 -	In the scene where Ace and Mel meet the Dragon, watch the momentary expression of pain on Ace's face when Mel screams. According to Sophie Aldred, she had a massive headache that day, and here she was standing inches away from Bonnie Langford in full throat. (Lucky her.)
ep 1,2 -	In the (rather literal) cliffhanger to episode 1, the Doctor ends up dangling over a precipice, clinging only to his umbrella. In several shots, it's established that it's quite a long way down – but eventually Glitz rescues him by going to the bottom of the "precipice" and letting him step down onto his shoulders, implying that the fall was only a few feet instead. [Not to mention the monumental stupidity of the whole cliffhanger, namely why the Doctor decided to climb down the chasm for no apparent reason in the first place...]
ep 2 -	When the Dragon fires at Mel and the ray hits a stalagmite next to her, watch how the polystyrene "rock" wobbles back and forth.
ep 2 -	Watch out for the Doctor's amazing appearing umbrella – one minute he has it, then it's gone, then, for a brief moment on Glitz's ship, he has it again.
ep 2 -	When the zombie Pudovkin gets shot by the Dragon, his body seems to vanish immediately afterwards, as the Doctor and co. move forward into the space where it used to be, and off down a side corridor.
ep 2 -	Whose bright idea was it to hide the Dragonfire on the dark side of Svartos (the only part of the planet Kane could get to)?
ep 3 -	Having spent thousands of years building up his army of mercenaries, just why does Kane throw them all away so casually?
ep 3 -	In the final TARDIS scene, the electrical cable powering the console is blatantly obvious.

Remembrance of the Daleks:
ep 1 -	In the opening scene, several of the schoolkids are wearing post-1963 clothes.
ep 1 -	Look out for the soldier who snaps to attention a good five seconds after the rest of his troop.
ep 1 -	When the soldier in the junkyard is spectacularly exterminated, watch how the corrugated iron sheets move slightly before he hits them (obviously disturbed by the wire used to pull the stuntman back into them). The wire is also briefly visible in the close-up of the stuntman dropping to the ground.
ep 1 -	Listen out for the very obvious overdubbing on Sylvester McCoy counting the seconds to the Nitro-9 explosion.
ep 1,2 -	In several scenes, present-day vehicles can be seen driving past or parked nearby. In particular, several can be seen through the van windows as the Doctor and Ace are driving along in episode 1, and a modern red bus drives past in the background as the headmaster comes up behind Mike in the cemetery.
ep 1 -	Watch for when the Doctor switches seats with Ace in a van, supposedly during a 1-second blackout as they drive under a bridge. But look closely during the blackout and you can see the Doctor and Ace sitting perfectly still until the lights come on, when they bounce down leaving Ace to be surprised at the seat change (and the editing!) [This blooper was "fixed" for the DVD release.]
ep 1 -	While in Gilmore's HQ, Rachel talks to Allison about the Dalek in the junkyard, using the word "Dalek" even though she hasn't heard it before.
ep 1 -	When the Doctor and Ace first meet the headmaster, watch for the camera that pops out at the top right of the screen.
ep 2 -	When the Doctor reclaims the baseball bat from the Hand of Omega, watch how it suddenly changes position between shots as he goes to leave – one moment it's in his left hand, the next it's in his right.
ep 2,3 -	Post-1963 buildings are visible in many of the exterior scenes, for example in the cemetery as the headmaster attacks Mike. The modern skyline is also obvious in the scene in part 3 where the Hand of Omega is being unloaded from Ratcliffe's truck, and again later in the chase scenes.
ep 2 -	When the headmaster attacks Mike in the cemetery, he follows him in through the gates, which are standing wide open. But look at the background when they're actually struggling – the gates are suddenly closed!
ep 2 -	The TV announcer announcing "Doc..." gives the time as a quarter past five. This happens in episode 2 between breakfast and lunch! Besides, if it was really November 23rd, it would be pitch dark outside by 5:15pm!
ep 2 -	Sylvester McCoy has a pronunciation problem when he tries to tell Gilmore to order "plastic explosives with integral detonators" – the second-last word comes out as "intregal"...
ep 3 -	You can see Sylvester McCoy's shadow on the wall of the school cellar steps as he waits for his cue to come down and join Rachel and Allison at the transmat.
ep 3 -	Just before the Doctor tells Ace about the Hand of Omega, watch as Sophie Aldred trips on some sort of cable on the floor.
ep 3 -	When the Black Dalek says "Advance!" as it leads the way out into Ratcliffe's yard, you can notice that its lights have been made to flash using an electronic effect added in post-production (since the actual lights failed to work during shooting).
ep 3 -	Why is Ratcliffe so clearly surprised to see the little girl when she reveals herself in the battle computer? Had he never thought to take a peek around the front of it before?
ep 3,4 -	While the Dalek shuttlecraft is landing, the view from outside shows that the window to the laboratory is wide open. However, from the inside, the window is closed until the blast rips it from the frame. [Also, why weren't the windows already smashed from when the shuttlecraft created the marks the Doctor looked at in episode 1? Or did someone clean it all up and repair the windows without wondering how it happened?]
ep 3,4 -	When the Dalek shuttlecraft lands, you can see the wires lowering it down, along with the metal eyelets attaching the wires to the shuttle at each corner.
ep 4 -	When Ace is yelling at Mike for being a stinking dirty scumbag (the second time), she's supposed to be very angry. However, it's plainly clear that she's doing her best not to laugh. Near the end of the scene, she has a grin breaking through, and you can see her actually smirking as she runs off screen.
ep 4 -	When the Doctor, Rachel, Mike et al are on the search for Davros, Rachel enters the metal grille room and mysteriously appears barefoot. When she slides out of the pipe again, she is wearing shoes.
ep 4 -	When Mike brings the time controller back down the metal stairway past Ratcliffe's body, note the large hole in one of the window panes behind the body, which wasn't there when Ratcliffe was killed just a few minutes earlier.
ep 4 -	When the little girl kills Mike Smith, he falls back against the stairs, which then slide backwards in a most un-stair-like manner.
ep 4 -	Watch the Black Dalek just before the Doctor arrives and destroys him. As he turns to face the second of the approaching vans, the top of his dome slips sideways as if it's about to fall off.

The Happiness Patrol:
ep 1 -	On both occasions that Silas P presents his card (first to Daphne S, then later to the Doctor), he gives it to his victims the wrong way around. They have to surreptitiously turn it over so that the side with his name on it is facing them, and then act surprised when he tells them to flip the card over to reveal the words "Happiness Patrol Undercover", as if they hadn't seen it before.
ep 1 -	Why do the Happiness Patrol kill Silas P, since they are obviously aware of who he is and what he does?
ep 1 -	While the Doctor is repairing the buggy, one of the Happiness Patrol runs on screen in the background, realises it isn't her cue, and runs back off-screen again.
ep 2,3 -	When the Doctor taps the sugar crystal stalagtites, they swing about a bit. Surely they would have broken off or disintegrated?
ep 2 -	When Earl Sigma leaves the Doctor and Trevor Sigma, Trevor turns as if hearing something before the harmonica music starts (then he says "Hey, that's nice" just as it begins).
ep 2,3 -	Why does the Doctor need to ask the forum doorman whether Ace is performing tonight, when he's standing right next to a big poster of her with "Tonight at the Forum" emblazoned right across the top?
ep 3 -	When Helen A places Fifi into the pipe entrance, the back wall of the set can be seen through the circular hole, rather giving away the fact that it doesn't actually lead into a pipe of any kind.
ep 3 -	The shots of the Kandy Man in the pipes show him without the metal moustache-like thing he wears across his face in the rest of the story.
ep 3 -	In his message from the shuttle, Gilbert M refers to the leader of Terra Alpha as "Ellen Hay".
ep 3 -	When Susan Q supposedly shoots Daisy K's gun from her hand, it's quite obviously just pulled away on a wire of some kind.

Silver Nemesis:
ep 1 -	In 1638, a mathematician calculates that Nemesis will return exactly 350 years later on 23rd November 1988. Unfortunately, something happened in 1752 which would render his calculations out by nearly two weeks – the UK switched from using the Julian calendar to the Gregorian calendar, which meant that the 11 days from the 3rd-13th September 1752 were simply skipped over. So Nemesis should actually return on 4th December (11 days later than 23rd November).
ep 1 -	The setting is supposed to be England in late November, but Ace is wearing a T-shirt and the jazz quartet are playing outdoors in bright sunshine!
ep 1 -	Why do the Cybermen-controlled 'Walkmen' shoot at the Doctor and Ace? As the Cyberleader notes at the beginning of part 2, the Cybermen had not anticipated the Doctor's latest change of appearance.
ep 1 -	When the Doctor and Ace fall into the stream, the Doctor drops his umbrella to the left (i.e. downstream), and falls off the bridge to the right (i.e. upstream). When we see him again, he is swimming upstream, with the umbrella in his hand.
ep 1 -	Suspension of disbelief is severely strained when Lady Peinforte and Richard pop out of the air into a Windsor cafe in 1988, and the patrons and waitresses, after just a few stares at them, simply go back to their normal business!
ep 1 -	For an object that's just fallen to the ground from space, the Nemesis comet makes a ridiculously small explosion and leaves an absurdly tiny crater.
ep 1 -	The driver of the police car is overcome by the gas and slumps down out of the driver's seat to the ground. Yet he is later found by DeFlores and co. with most of his body underneath the car.
ep 2 -	As the Cybermen attack for the first time, one of them (just left of centre) is clearly having trouble keeping his head in position.
ep 2 -	As the Cyber-ship comes down to land in the field, a faint image of whirling helicopter blades is visible behind it. [A helicopter was used on location to make the foliage move, and the image of the ship was overlaid on it in post-production.]
ep 2,3 -	The Doctor and Ace use a jazz tape to jam the Cybermen's communications and keep them from calling for reinforcements. Then in episode 3, they run out of tape (because, even with all the other gizmos he built into the tape deck, the Doctor forgot to include auto-reverse!). But after the tape stops, the Cybermen never call for those reinforcements.
ep 3 -	While following Ace across the gantry, the camera is jolted as if the cameraman either stumbled or bumped into the railing.
ep 3 -	The Cyberman that falls from the gantry is obviously just an empty costume.
ep 3 -	After DeFlores is killed by the Cybermen and falls to the ground next to the Nemesis comet, his body seems to simply vanish in the later scenes.
ep 3 -	At the climax of the story, the brief cutaway shot of the Cyberleader saying, "Launch the Nemesis!" fails to match the footage of him on either side of it. [This blooper only appears on the extended video version.]

The Greatest Show in the Galaxy:
ep 1 -	Bellboy gives us a glimpse of "builder's crack" as he gets thrown to the floor by the clowns and his trousers fall down just a bit too far.
ep 2 -	Why is the Doctor surprised to find himself a prisoner, given that the bars are only covered by drapes on the inside of the cage? He even leans on the bars next to the doorway (when he is talking to the Captain) before entering the cage.
ep 2,3 -	When the Doctor drops the club down the well, he holds it vertically and simply lets it fall, but the shot of it descending shows it spinning horizontally.
ep 4 -	When Mags is attacking the Doctor, the Captain says, "Come on Mags, you can trust me; you know that, don't you?" followed immediately by, "Once he's out of the way, we can split the proceeds." The problem is that his position changes suddenly between the two shots; in the first one he's some distance away from Mags, in the second he's right next to her.
ep 4 -	When the Doctor and Mags throw themselves through a rip in the tent wall to escape the clowns, the mattress placed for them to land on is clearly visible.

Battlefield:
ep 1 -	Look for the "creases" in the wall inside the TARDIS, which look as if the wall was just a sheet hung up behind the console. [Surprise, surprise, it actually was a sheet – the TARDIS wall prop was apparently unusable due to poor storage between seasons. This also explains the lack of TARDIS scenes throughout the rest of season 26.]
ep 1 -	Shou Yuing says that she saw a bloke go through a wall, when it was clearly visible that he went through the ceiling.
ep 1 -	In the last fight scene of the episode, there is a noticeable pause between the grenade exploding and the knight being thrown into the air.
ep 2 -	The column next to Peter Warmsly wobbles very obviously when the scabbard goes flying through the air and sticks into it.
ep 2 -	Listen for a slight hint of Pee-Wee Herman in Mordred's laugh as he's merging the two points in space and time.
ep 2,4 -	When the Doctor takes hold of Excalibur, his hands are holding the blade itself – the edges must not be very sharp! Similarly, in Part 4, when Ace crashes into Morgaine and sends the sword flying, the Doctor catches it by the blade.
ep 2 -	The shots of the UNIT helicopter with smoke pouring from it clearly show the smoke coming from a small device mounted on one of the landing skids, rather than from the body of the helicopter itself.
ep 2? -	When the Doctor and Ace are descending the stairs into Arthur's ship the Doctor points out that the concrete has gone soft with age. If this is true then how on Earth did it survive the Nitro-9 explosion when every thing else was destroyed?
ep 3 -	In a couple of shots at the end of the water tank sequence, as Ace disappears up out of the airlock, the glass front of the tank can be seen to be badly cracked. [This was filmed just before an accident which caused a major crisis in the studio, as the tank wall fractured and water poured out over the studio floor.]
ep 4 -	The Doctor's hat falls off and rolls a long way away from him when he is knocked to the ground, but when he rushes into the hotel immediately afterwards it has magically reappeared back on his head.
ep 4 -	The Brigadier delivers a ridiculously wimpy karate chop to the Doctor (which still somehow manages to knock him out).
ep 4 -	Considering Morgaine's powers of dimension-hopping and teleportation, what exactly is the point of the Doctor telling the Brigadier to lock her up at the end of the story?

Ghost Light:
ep 1-3 -	Archaeological evidence shows that Neanderthal Man possessed a throat structure which would only allow coarse, simple speech sounds to be made, so Nimrod could not possibly speak as articulately as he does in this story.
ep 1 -	When the candle carried by Mrs. Pritchard suddenly flares up in front of Josiah, the actress's thumb can be clearly seen in the close-up operating the mechanism in the candlestick controlling the flame.
ep 1 -	As Nimrod and the Doctor enter the room where Redvers faces the blinding light, the key (which Nimrod supposedly just used to unlock the door) can be seen dangling limply from the lock, rather than being fully pushed into the lock as it should be.
ep 2 -	While the sight of Inspector Mackenzie asleep in the bottom drawer certainly makes for an arresting visual (no pun intended), one has to ask the question: how could he actually fit into that drawer? The chest of drawers is never actually shown in full, probably for just this reason, but it's quite clear (see, for example, the shot of the Doctor watching Gwendoline open it at the start of the episode) that it's not much deeper than the width of the room's door. That makes it far too small to cram the inspector into, even if he wasn't (as he seems to be) laid out straight in his drawer.
ep 2 -	When Josiah and co. come to life in the upper observatory as the clock chimes six, Gwendoline takes a couple of attempts to successfully get up from her seat.
ep 3 -	Why on Earth does Josiah think that assassinating Queen Victoria will result in him gaining control of the British Empire?

The Curse of Fenric:
ep 1-4 -	The roadside signposts visible throughout the story should have been removed in 1943 as part of the defence preparations against possible invasion.
ep 1,2 -	The idea of using the Ultima machine to translate the Viking inscriptions (expressed by both Judson and Millington) makes no sense. Translating a language has nothing in common with deciphering an encrypted message, and a computer would be of no help at all in "decoding" a message in an unknown language.
ep 1 -	The inhabitants of 1943 shouldn't readily know who Jane Russell is – she didn't become famous until her debut film The Outlaw was a box-office hit three years later. [Although the film originally had a limited release in the US in 1943, it was quickly withdrawn by the censors and not released widely until 1946.]
ep 2-4 -	As Jean and Phyllis run into the water to go swimming, they seem to be wearing dark shoes or sandals. But in most of their appearances as Haemovores later in the story, they are wearing bright white (and suspiciously modern-looking) sneakers.
ep 2 -	When the Russian soldier is enticed into the water by the now-Haemovores Jean and Phyllis, watch the amazing behaviour of his helmet, which he drops into the water as he moves towards them. When the camera angle changes to a shot of him from the front, we see his helmet slowly drift from directly behind him out to the right of screen. Then we cut to a shot of Jean and Phyllis, then back to the soldier – whereupon his helmet again drifts from directly behind him off to the right! Finally, when the other Haemovores drag him down into the water, look behind him and you'll see the helmet, sitting quietly on the beach well above the waterline!
ep 3 -	When Ace is at the top of the ladder her underpants are black. By the time she gets down, they have changed to white.
ep 3 -	As Sorin leads his men through the graveyard (just before he sees Ace being attacked), they somehow manage to avoid seeing the group of Haemovores which are plainly visible in the background, attempting to break through the church door.
ep 3 -	When the Russian soldiers are running to save Ace from the Haemovores, the shadow of somebody can be seen casually walking in the opposite direction.
ep 3 -	When Ace is being attacked by the Haemovores, she bops one of them on the head, causing its mask to go up and revealing part of the actor's neck.
ep 3 -	After the Nitro-9 explosion which Ace uses to blow up the wall sealing up the mine shaft, the wall is clearly still standing, unaffected by the blast. But after a quick cutaway to the Doctor and Ace, it has vanished completely by the next shot.
ep 4 -	Despite all the apparent torrential rain, most of the exterior shots in this episode show blue sky and white clouds.
ep 4 -	At the end, when Ace and the Doctor run out of the exploding bunker, the Doctor stumbles in the mud and puts his hand out to stop himself falling, getting mud all over it, which he even stops to look at in an almost symbolic gesture. Then they go in for the close-ups with him and Ace and when he puts his hand up to rub her nose (same hand), it's perfectly clean.

Survival:
ep 1 -	The reflection of a large grey boom microphone is visible in the glass panel next to the door as the Doctor and Patterson leave the youth club.
ep 2 -	When Ace watches Karra approaching the lake, look out for the electricity lines in the background of the (supposedly primitive) Cheetah Planet.
ep 2 -	The Master captures Midge with a lasso trap around his feet, but we never see him untie Midge's legs before the two of them teleport away (even though the action is supposedly continuous between the two events).
ep 2,3 -	Also when Midge is captured, the sabre-tooth he's carrying gets knocked to the ground. Neither he nor the Master pick it up before they teleport to Earth. Yet in Part 3, the Master is able to present it to Midge as he's about to ride his motorbike towards the Doctor.
ep 3 -	The motorbike collision stunt is totally ridiculous; the director shows the collision in a wide long shot, with a tremendous explosion and fireball engulfing the two bikes. Yet subsequent shots show that both riders were supposedly thrown clear – the Doctor completely unmarked, and Midge with just a few soot marks on his face! Unbelievable.