Castrovalva:
ep 1 -	The Doctor's footwear has regenerated with him.
ep 2? -	When Tegan & Nyssa start to carry the zero cabinet (after blowing up the wheelchair in the stream), Nyssa gets her tiara caught on an overhead branch - and it stays up there. Neither Nyssa nor Tegan seem to notice.
ep 4 -	When they're trying to find the way out of Castrovalva, Adric announces "I can see". He then sees the exit to the left - before he's even looked in that direction!
ep 4 -	While the two Castrovalvians are searching for the cause of the broken window, there is a scene when they look meaningfully at each other. Right before the camera cuts away, the wall behind them starts to collapse.

Four to Doomsday:
ep 1 -	When Monarch tries to open the TARDIS, see if you can spot the head of a crewmember hiding behind a crate in the foreground.
ep 2? -	Out of 3,000 Aboriginal languages, it's astounding that Tegan can speak the correct one -- especially since the language in question is over 35,000 years old!
ep 2? -	Tegan's sketch of "Earth fashions" is awfully quick -- and awfully good. If she's that talented, what's she doing as an air stewardess?
ep 3 -	On two separate occasions, the Doctor uses his sonic screwdriver to send a monopticon spinning around rapidly, both times in an anti-clockwise direction. However, the monitors in Monarch's control room show the images as if the monopticons were spinning in the opposite direction (clockwise).
ep ? -	Look closely at the Chinese Dragon to spot the dancers underneath, dressed in their most authentic Ming Dynasty jeans and T-shirts!
ep ? -	The scene with the Doctor space-walking and using a rebounded cricket ball to propel himself back to the TARDIS must have Isaac Newton spinning in his grave! For one thing, the Doctor couldn't have been propelled backwards that fast by such a relatively small object as a cricket ball. What should happen, if the Doctor were to actually try it, would be this: After releasing the ball in the first place, he would have started moving backwards by the action of throwing the ball. (Remember Newton's Third Law?) And not just moving in a straight line, mind you - he would have spun backwards in a slow cartwheel as a result of pitching the ball cricket-style, as he did. Assuming he was lucky enough to get a perfectly perpendicular bounce from that spacecraft, the ball would have caught up with him, impacting with whatever part of his body was facing that way at the time, increasing the rate of his spinning motion (but not by much, certainly nowhere near as fast as portrayed on-screen).

Kinda:
ep 4 -	In the circle-of-mirrors scene, it's very clear to see that one of the mirrors is missing (the one in the bottom-left corner of the high-angle shots). This is, of course, because the cameras doing the ground-level shots needed a gap in order to shoot the action inside the circle.
ep ? -	Watch out for the incredible bouncy snake.
ep ? -	Look very closely at the forest floors, and you'll be able to see cords (which are large power lines). Apparently JNT saw this during production, and it was decided to just "buy" the shot, and hope it looked like tree roots (!)

The Visitation:
ep 4 -	During one TARDIS scene with Adric and Nyssa, they mention that it is getting dark outside and the next scene (with the horse) clearly takes place during the evening, while it is getting dark. However, in the indoor scene following that (with the Doctor, Tegan, and Mace), there is plenty of bright sunshine visible through the window.
ep ? -	When Nyssa is pushing the Terileptil's android into her room, you can see that her pants have fallen down a bit too far. She hurriedly pulls them up, making a big show of it in the process.
ep ? -	Watch for the disappearing/reappearing hat trick that Peter Davison does in this story. One scene he's wearing it, next scene it's gone.

Black Orchid:
ep 1 -	As the TARDIS crew arrive at the cricket match, the batsman hits the ball towards the boundary, and then a fielder runs after it - but then the umpire calls a wide (it can't be a wide, because the batsman hit it).
ep 2 -	The policemen from 1925 recognise the TARDIS, although TARDIS-style police boxes weren't introduced until 1929.

Earthshock:
ep 1 -	Watch the scene when the last soldier in the search party hears a noise down in the caves and turns around. By the time he does so, the androids have disappeared down a side corridor, but the shadow of one of them can clearly be seen moving along the cavern wall. The soldier would have had to have been blind to miss it!
ep 2 -	Just before he receives a message saying that the freighter has received security clearance, the Cyberleader tries to press a button on his console - and misses. But we hear the appropriate sound effect anyway.
ep 2 -	As the Cybermen are going through the various clips of the Doctors, before each new Doctor clip comes on, slow the tape down and you'll see a frame of the Cybermen looking at themselves in their viewing ball!
ep 3 -	As Tegan complains that she's exhausted and Scott tells her to keep her voice down, look in the shadows behind them - something that looks like a stick is being waved around in the darkness. Then, as they climb the stairs on their way to the bridge, you can see a shape (vaguely resembling a crew member holding a clipboard) moving about in the background.
ep 3 -	After one of the first battles, as the Cybermen are walking up some stairs through the dead bodies, one of them stumbles.
ep 3 -	During the cliffhanger, it's blatantly obvious that the three columns of advancing Cybermen are merely mirror images - watch the middle one's right hand disappear!
ep 4 -	Look at the scene after the troopers and Tegan are separated, when the troopers return to the TARDIS. There are four of them remaining at this point: the commander, a male with straight hair, a male with curly hair and a female. As they enter the TARDIS, a Cyberman grabs the female trooper. In the next shot (inside the TARDIS) the commander, the male with straight hair and the female make it inside, closely followed by the Cyberman, but the curly-haired male trooper is missing! After they leave the TARDIS and are evading Cybermen in the freighter's hold, the female trooper has disappeared, and the curly-haired male one is back!
ep 4 -	As the Doctor, Tegan and Nyssa are being led away from the bridge, the Cyberleader loses his footing when he gets to the bottom step.
ep 4 -	Watch Adric as he's trying to type in the final code on the keyboard - he tentatively taps a key or two, then flinches away from the console. This is because Matthew Waterhouse knows it's going to blow up any minute, thanks to the final remaining Cyberman - though of course Adric isn't supposed to know this!
ep 1-4 -	The Cybermen's mouth/chin pieces were originally clear plastic, but were later sprayed lightly with silver paint. Due to the order of filming they tend to swap back and forth. See if you can spot the changes.
ep ? -	At one point, the Doctor explains the Cybermen's vulnerability to gold by stating that it "clogs their respiratory system". But later on, after the Captain says she has evacuated the the air from the hold, the Doctor says: "Oh, they don't need air" -- so why do they need a respiratory system?

Time-Flight:
ep 1 -	Having travelled about 140 million years into the past, the Doctor is more or less correct to surmise that the Concorde has landed in the Jurassic period. But then he blows it by saying "we can't be far off the Pleistocene era" -- whereas in fact they're 138 million years off! The Pleistocene epoch (not "era") began less than 2 million years B.C.
ep 1 -	As the Doctor & co. search for the original Concorde, Captain Stapley fails to prove his eyesight airworthy when he manages not to notice the missing plane straight in front of him (Tegan, who is standing further away, has no trouble spotting it).
ep 1 -	Stapley and Nyssa warn the Doctor about the Plasmatons appearing behind him before they're actually visible on screen.
ep 3 -	Anthony Ainley has trouble getting out of his Kalid disguise.
ep 3 -	Watch out for the Master accidentally activating his TCE (just as the Doctor says the line "No heroics") -- so technically, Stapley and friends should be dead!
ep 3 -	When Nyssa says "It seems like we're winning" in the Xeraphin chamber, you can see the boom mike shadow on the wall behind her.
ep 3 -	In the scene where Nyssa is about to be absorbed by the Xeraphin into their casket, she's standing in front of it glowing in a beam of pale light. While she's standing there shouting, a human hand briefly emerges from the sarcophagus, and then falls back down. Presumably, this was the hand of one of the actors who would later play an emerging Xeraphin.
ep 4 -	When Captain Stapley's Concorde finally manages to take off from 140,000,000 B.C., we see hazy stock footage of an airborne plane imposed over the prehistoric set. While the plane is lifting off, a crow flies across the screen from right to left. Now, while crows were quite common in 1983, were they really that ubiquitous in the Jurassic era?

Arc of Infinity:
ep 3 -	When the Doctor types in the electronic security code, his finger movements don't match the numbers he's saying.
ep 3 -	Leonard Sachs as Borusa stutters most amusingly on the word 'permit' while uttering the line: "Only the gravest emergency would permit me to do as you want."
ep 4 -	Producer John Nathan-Turner can be seen passing behind the telephone box as the Doctor is consulting the phone book. (He's wearing a sheepskin coat.) This qualifies as a blooper because it was supposedly accidental - he was apparently shooing away tourists at the time. Though JN-T himself has subsequently claimed that it was a deliberate Hitchcock-esque cameo (a likely story!)

Mawdryn Undead:
ep 1 -	When the Doctor and Turlough are about to leave the TARDIS to disable the T-Mat signal on Earth, the Doctor has problems keeping the red door lever in the "door open" position. Each time he tries to move his hand away, the lever starts slipping down, and it takes a couple of tries before he gets it to stay in place.
ep 4 -	While talking to Turlough in the TARDIS, the Black Guardian appears to spit on himself.
ep ? -	There's a scene where Nyssa is running towards the TARDIS in a clearing. See if you can notice Sarah Sutton's total misunderstanding of where the camera is, or indeed which camera she is on.

Terminus:
ep 1 -	Watch where Nyssa accidentally drops her book in the corridor of the Lazar ship. Some poltergeist has moved it at least a yard by the time the Doctor finds it 10 minutes later.
ep 2? -	Near the end of the episode, there is a scene where The Doctor and a woman (Goddard?) are walking along a sort of scaffolding towards some stairs. We see them about to descend and the camera pans down to one of the Vanir. As he moves towards the bottom of the staircase a foot can clearly be seen up towards the top. Then, a small superimposed step is matted over the foot. It even moves with the shot. They tried to cover it up, but couldn't. In fact, they made it worse by attracting attention to it, the fools.
ep 4 -	Turlough is trying to operate the TARDIS console when the Black Guardian appears on the scanner, telling Turlough not to bother with the TARDIS. Turlough yells "I can operate it!" and slams his fist down hard on the console - so much so that it visibly wobbles.

Enlightenment:
ep 1? -	Early on in the story, when the sailors in Striker's ship are running up the stairs, one of them stumbles slightly.
ep 1 -	When the ship experiences turbulence, the liquid in the glasses doesn't.
ep 3? -	When Tegan enters Wrack's cabin, she's talking (with her eyes open) when she's frozen by Wrack. We then cut to another shot of Tegan, with her eyes closed. If she was frozen, how could she close her eyes?

The King's Demons:
ep 1 -	French was still the language of the English royal court in the early 13th century, so why is Sir Gilles the only one who speaks it?
ep 2 -	Kamelion (as King John) is seen playing a lute, but he fingers it as though it were a guitar. (The lute is not played like a guitar.)

The Five Doctors:
-	The Doctor explains that the Eye of Orion feels like Earth after a thunderstorm because of the "high bombardment of positive ions". Nice try Doc, but it's actually negative ions which are present in large quantities after a thunderstorm.
-	After the obelisk gobbles up the Third Doctor and Bessie, it moves off - but you can see Bessie remain there for about half a second before she fades away. (This blooper isn't visible in the Special Edition, due to the re-edited special effects.)
-	If the High Council has the power to offer the Master a new lifespan (in return for rescuing the Doctor), why did Borusa, President of the High Council, choose to pursue immortality in such a roundabout way?
-	When the Master arrives in the Death Zone, he's wearing a rather fetching black cloak - which he didn't have a few moments earlier when he stepped into the transmat.
-	The Cybermen following the Master into the Dark Tower must have been blind not to see the First Doctor and Tegan as they ran for cover.
-	After Borusa uses his powers to freeze the Doctor's companions, they all remain completely motionless - except the Brigadier, who turns his head to watch Borusa go.
-	When Rassilon is giving Borusa immortal life, Borusa has his hand dramatically poised - and when he lowers it, it bangs into Rassilon's coffin.

Warriors of the Deep:
ep 1 -	Look out for Icthar's (human) eyes, which can clearly be seen blinking through his costume.
ep 1,2 -	Tegan acquires a bra between episodes 1 and 2.
ep 4 -	At one point, as the Doctor is standing on the bridge, two Sea Devils exit behind him and manage to walk straight into each other.
ep 3 -	The Silurian costumes come apart in places, and white T-shirts can be seen through the holes! (Many such problems were caused by the fact that this story fell more behind production schedule than any other. Apparently some takes were, as far as the actors kjust full-dress rehearsal.)

Frontios:
ep 1,2 -	As Captain Revere watches the Earth revolve beneath him, the helping hand of a crew member can be seen making the world go round.
ep 1,2 -	When Plantaganet is shot at the end of episode 1, he clutches the right side of his chest - but when we see him collapse in episode 2, he clutches his left side. Then, a few scenes later, when his shirt has been removed, we see that the wound is located centrally on his torso.
ep 2,3 -	In episode 2, Tegan is being chased by Brazen and some guards, so she heads for the surface. She locks the door by putting a rod through the two handles on the double doors. When the doors are being broken open in episode 3, the rod is on the top of the handles, not through them.
ep 4 -	In one scene aboard the still incomplete TARDIS, you can just barely see the central column of the console rise to its 'up' position on the left side of the screen. How could the column move if none of the controls were operative?

Resurrection of the Daleks:
ep 1 -	Somebody forgot to include Leslie Grantham in the credits.
ep 2 -	As Mercer and Stien escort the Doctor to confront Davros, watch the wall behind them as the door slides shut. The wall is semi-transparent, letting you clearly see the silhouette of a stagehand push the door shut, straighten up, and walk off.
ep 2 -	Somebody forgot to include a picture of Leela amongst all the other companions in the mind-drain sequence.
ep 2 -	When Tegan finds the canisters, she mentions how light they are and tosses them about. However, when they arrive on the Dalek ship it takes two troopers to pick one up. Must be all that weight training they put air hostesses through.
ep 2? -	In one of the scenes where the Doctor is strapped to a mind probe, there is another body in the background next to Tegan and Turlough (supposedly a corpse). But keep an eye on its hand, and you'll see it moving.

Planet of Fire:
ep 1 -	Peri dries off awfully quickly between nearly drowning and being carried into the TARDIS by Turlough a couple of minutes later.
ep 1 -	You see the mountains move against the desert floor when the Doctor is walking on the surface of Sarn.
ep 1-4 -	Watch how the question marks on the Doctor's braces keep changing the way they face, depending on whether Peter davison is appearing in the studio or on location.
ep 4 -	It's odd that when the Comparator is removed from the Doctor's TARDIS, it is completely immobilised - but when the Doctor removes the Comparator from the Master's TARDIS, Kamelion is still able to move it into the flame jet.

The Caves of Androzani:
ep 1? -	Morgus's remote control quite blatantly belongs to a twentieth-century television set. Admittedly, the company logo has been taped over, but the volume, brightness and contrast controls are clearly visible in one close up.
ep 1 -	The Doctor and Peri are exploring the cave system when Peri falls through a hole and out of sight, supposedly down a slope and into a spectrox nest. But after just enough time to say "boing", watch as Nicola Bryant's head makes a quick reappearance.
ep 3? -	Maurice Roeves (playing Stotz) screws up the line "All right, then where's the two kilos?". He seems to start saying "spectrox" before switching to "two".
ep 4 -	When the Doctor is in the cave getting milk from the Queen Bat, the shot has been reversed - you can tell because the question marks on the Doctor's collar are backwards.
ep 4 -	As the Doctor is escaping from the gun-runners, his coat is stained on the front of the right shoulder by a mud burst. But shortly afterwards, when the Doctor is climbing down to find the Queen Bat, his coat is completely clean. And then, when he is actually extracting the Queen's milk, the stains have magically re-appeared - only to disappear again as he climbs back up the rock face afterwards. And no prizes for guessing what happens in the next scene - yes, the mud stains reappear!
ep 4? -	When the gun-runners are throwing the guns off the catwalk, one of them gets a little stuck and has to be pushed again.
ep 4 -	Watch out for the mouse holes visible in the TARDIS during the regeneration.