The Ice Warriors:

10ep 1,6 – In episode 1, the TARDIS materialises on its side, but at the end of the story it dematerialises right side up.

20ep 1 – Immediately after the TARDIS materialises and it starts sliding down the snow bank, the ropes pulling the TARDIS prop are glaringly obvious in the lower left of the screen.

30ep 1 – As the scientists wheel the frozen Ice Warrior into their base, watch out for the gleaming silver of a boom microphone sticking out of a doorway, midway down the corridor.
[The pristine work of the Restoration Team makes it a lot easier to spot this sort of thing. Cheers fellas!]

40ep 1 – Clent gets it wrong when explaining how the Ice Age came about. He says that too many plants were destroyed, and as plants produce carbon dioxide, that meant a shortage of CO2 in the atmosphere, hence the Ice Age. However, plants use up CO2, so getting rid of them would raise the temperature (under current scientific thinking, anyway — this is the same principle behind the greenhouse effect).
[Poor old Clent obviously wasn't paying attention in science class]

50ep 1 – Varga's helmet design in episode 1 is different to the rest of the story. In fact, the Warrior thawed out of the block of ice actually looks like Turoc (with his helmet covering only the upper half of his face) rather than Varga.

60ep 2 – When discussing how the Ice Warrior could have been thawed, the Doctor says, "if that current flowed through a low resistance..." This is incorrect; it's current flowing through a high resistance that generates heat.
[Brian Hayles corrected this error in the novelisation]

70ep 2 – Arden flubs a line: "They didn't...couldn't have come this far."

80ep 3 – Another small flub courtesy of Patrick Troughton: "There is one thing you could do to me... for me..."

90ep 4 – Another gas-related blunder occurs when it is stated that Mars has an atmosphere mainly composed of nitrogen. In fact, it's 95% carbon dioxide and only 3% nitrogen.

100ep 4 – Various loud styrofoam squeaking sounds are heard as Victoria makes her way through the "ice" tunnels.

110ep 4,5 – In the episode 4 cliffhanger, the Doctor says he "won't answer any questions until I'm properly addressed." By the start of episode 5, this has changed to "properly introduced".

120ep 4,5 – In the same vein, watch the falling pressure gauge in the airlock — when episode 5 begins, the pressure is noticeably higher compared to the end of episode 4.

130ep 5 – In an extreme close-up of Varga talking to the Doctor when he's in the airlock, a production crew member can be seen reflected in the Warrior's eye-pieces.

140ep 5 – The door to the engine room of the Ice Warriors' ship fails to close properly behind the Doctor and Varga as they return to the control room. But later scenes in the episode show it fully closed.

150ep 5? – While the Doctor is describing the atmospheric conditions around the Ice Warriors' cave, Patrick Troughton has trouble saying the word "atmosphere".

160ep 1-6 – Miss Garrett's outfit changes without explanation between episodes. She wears one outfit in episodes 1, 2, and 6, and a noticeably different one in episodes 3, 4, and 5.

170ep 6 – The credits for this episode mis-spell Brian Hodgson's first name as "Bryan".

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