The Mind of Evil:

10ep 1 – As the Doctor takes his seat for the demonstration of the Keller Machine, he tosses his cape half over the man sitting next to him, and has to quickly rearrange it with a muttered apology.

20ep 1 – If Professor Kettering was only killed by his fear of drowning, how did all that water end up in his lungs?

30ep 2 – When Mailer's guards in the cell are playing draughts, they are sitting next to each other in a ludicrous position, so that one of them is playing sideways!
[This was obviously arranged purely so that they both have their backs to Mailer and can't see him reaching for the gun beneath his pillow.]

40ep 3 – Jo foils Mailer's first prison takeover attempt by grabbing his gun arm and smashing it over her knee to force him to drop his gun. Evidently this was very painful for Katy Manning, as all through the rest of the scene and the ensuing fight she's clutching her left leg as she tries to act in control of the situation.

50ep 3 – As the Doctor and the Master have a fist-fight in the prison governor's office, they knock over a water carafe, and slip and slide all over the ensuing puddle.
[Apparently this was totally unintentional, but was kept in the finished episode because the director thought it looked good.]

60ep 4 – After the Master displays a picture of the Thunderbolt on the projector, he then changes to another slide (displaying a map) before switching it off and leaving. Soon afterwards, the Doctor and Jo come along, and when Jo turns on the projector, it has inexplicably returned to the original slide, showing the Thunderbolt.

70ep 5 – The Master must have been fond of that upright dark grey control panel that can be seen as part of his missile launch control gear — it's the same panel that was used earlier to control the Keller Machine!

80ep 6 – Is the best way to dispose of a nuclear-powered nerve gas missile really to explode it somewhere in south-east England?? (One of the most densely-populated areas in Europe!)

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