The Tomb of the Cybermen:

10ep 1 – Watch the Doctor and Jamie hold the main doors of the tomb closed with their feet as they pretend to struggle to open them!

20ep 1 – They have a funny concept of time on Telos. Parry tells Viner to "get back to the spacecraft by 1630" but then carries on by saying "so we'll meet back here at 1625. If anyone is missing that'll give us an hour to search..." I don't know how long an hour is on Telos, but I doubt it's 5 Earth minutes!
[Gerry Davis corrected this error in the novelisation]

30ep 1 – As Kaftan operates the revitaliser controls, Patrick Troughton can be seen lurking in the doorway behind her, and then quietly (but in full view of the camera!) moving into position behind the revitaliser projector, waiting for his cue to rush out and grab her arms.

40ep 2? – When talking about his formula, the Doctor says "the sum of the integrers".

50ep 2 – The back wall of the testing room wobbles badly as the large gun pushes forward into position.

60ep 2 – The rocket captain seems to suffer from the hiccups when he says "The first guy that s...sets foot in my rocket ship is gonna stop the repair work just like that!"

70ep 2 – As Victoria goes for the hatch control, Kaftan pulls out a gun behind her and tells her to stand back. Victoria stops immediately. Yet she didn't see the gun, and Kaftan barely, if at all, touches her back with it. Why does she stop?

80ep 2,3 – When Victoria rushes off to fetch Captain Hopper, Kaftan is lying unconscious on the floor. In the next episode, when she returns with Hopper and Callum, Kaftan is still unconscious, but is now slumped over one of the stools.

90ep 3 – The scene where Toberman is lifted up in the air by the Cybercontroller features an embarrassingly large and painfully visible safety harness.

100ep 3 – Hopper only takes two smoke bombs with him into the tombs, but somehow manages to make four explosions down there.

110ep 3 – As our heroes try to close the hatch while fighting off a Cyberman, a mysterious human voice goes "Ooooooooh" over the soundtrack. (It's not any of the characters on-screen, and it doesn't sound like the Cyberman.)

120ep 3 – Just after the previous blooper, we see the same Cyberman appear at the bottom of the ladder with the sleeve of his costume obviously giving way around the shoulder.

130ep 3 – An arm is briefly visible in the bottom-right corner of the screen just before the Cybercontroller says, "Release the Cybermats."

140ep 3 – How come nobody seems to notice the Cybermats until they're right on them? They're squeaking like a flock of demented bats!

150ep 3 – Just before Klieg first fires the X-ray gun, he turns with outstretched arms towards Kaftan in a way that actress Shirley Cooklin clearly wasn't expecting, as she has to duck quickly to get out of the way!

160ep 3 – Then, when Klieg actually fires the X-ray gun, the end flies off!
[Clearly they don't make futuristic weapons like they used to.]

170ep 3 – The rather good special effect of Klieg setting the wall on fire with the X-ray gun is unfortunately spoiled a moment later by the sound of an off-screen extinguisher putting out the fire.

180ep 4 – The shadow of a boom-mike (and its operator) is briefly visible in the background as the Doctor and co. watch the Cybercontroller struggle towards the recharger.

190ep 4 – When the Doctor locks the Cybercontroller into the revitalising chamber, why does he also start the revitalisation machine? Because of this, the Cybercontroller gains enough strength to break out of the chamber. Yet he was too weak to even climb into the chamber at first. Why doesn't the Doctor keep the machine switched off and just close the lid to lock him in (like Kaftan does to Victoria in episode 1)?

200ep 4 – When Toberman lifts up the Cybercontroller, it's all too obviously an empty costume.

210ep 4 – When the Cybercontroller crashes into the control console, the head flies off the (dummy) costume, but it's back in the next shot (of the real Cybercontroller on the floor).

220ep 4 – Earlier, when the rocket's fuel pumps were sabotaged, Hopper said that it would take three days to repair them, working non-stop. Then at the end of the story, after far less time than that has passed, he walks in and blithely says, "Well, the fuel system's OK. We can blast off any time"!

230ep 4 – Since the Cybermen were made to refreeze by simply reversing the film of them awakening, they retreat into their tombs backwards and the plastic film they broke through on the way out magically repairs itself.

240ep 4 – When the hatch is being closed for good, Jamie stumbles and nearly knocks the Doctor over.

250ep 1-4 – In this story we find that the only surviving Cybermen are frozen on Telos. The hatch can't be controlled from the inside since the Cybermen can't get themselves out. So how did they put all of this in place? If one Cyberman had to stay outside to lock the others in, where is he?

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