The Invasion:

10ep 2 – In the scene where she destroys the I.E. reception computer, Zoe mispronounces "integer" — using a hard 'g' instead of a soft 'j' sound.

20ep 2 – When the Doctor calls up UNIT on the radio and asks to speak to the Brigadier, the operator replies, "Stand by... out"! Shouldn't he have said "over"?

30ep 3 – When Packer is sent to see Professor Watkins, he gets into the lift and pushes the button for the 3rd floor. Later, the Doctor and Jamie escape from Packer after their visit to the professor, and flee into the lift. When the Doctor tries to sabotage it, Jamie complains, "But we're 6 floors up!" and Packer confirms a few minutes later that they are indeed on the 6th floor — so obviously that's where the professor is.
[Perhaps the toilet is on the 3rd floor?]

40ep 3 – When Jamie and the Doctor are climbing up the lift shaft to escape from the I.E. henchmen, look at the cables behind them. Considering they're supposed to be holding up a lift, the cables look worryingly loose.
[Between this and the other lift blooper above, clearly they should have taken the stairs.]

50ep 5 – Vaughn gets the names of his staff confused and calls Packer "Gregory" when ordering him to work with Professor Watkins on his machine. Packer wisely ignores the slip, and says "Yes, Mr. Vaughn" anyway.

60ep 5 – When the Cyberman comes out of the box (when they try to use the Professor's machine on him), part of the fabric gets stuck to him. The camera switches to a view of his back, and you can see the fabric being pulled away.

70ep 5 – In the same scene, Gregory carefully attaches the leads from the machine to the Cyberman's head, near the "jug handles." Before he can operate the machine though, the lead nearest the camera slides downwards and almost falls off the Cyberman's head. Fortunately, this doesn't seem to affect the operation of the machine.

80ep 5 – After Vaughn has consulted with the Cyber Controller, he sits down and talks to Packer. Look behind Vaughn at this point and you'll notice that the panel concealing the Cyber Controller has an awful lot of trouble closing.

90ep 6 – As the invasion starts, we see a montage of shots of ordinary people affected by the Cyber-control signal. In the first one, a man is walking down the street when he suddenly collapses against a wall. His footsteps have been badly dubbed onto the soundtrack — a couple of extra steps are clearly audible after he visibly stops moving.

100ep 6-8 – Why exactly do Cybermen need lace-up shoes? (You can see them in close-up while they're marching through the streets of London.)

110ep 7,8 – In Vaughn's last argument with the Cyber Controller, the wires used to move the oscillating part of the machine are visible, running from it out the back of the set. They are especially blatant in the first shot of episode 8 (which differs from the cliffhanger at the end of the previous episode).

120ep 8 – The Cyberman falling from the roof is plainly just an empty costume.

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