Silver Nemesis:

10ep 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).

20ep 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!

30ep 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.

40ep 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.

50ep 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!

60ep 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.

70ep 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.

80ep 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.

90ep 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.]

100ep 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.

110ep 3 – While following Ace across the gantry, the camera is jolted as if the cameraman either stumbled or bumped into the railing.

120ep 3 – The Cyberman that falls from the gantry is obviously just an empty costume.

130ep 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.

140ep 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.]

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