Inferno:

10ep 1 – A rather stylish quick cut, from Harry Slocum about to smash a technician's head in with a wrench to Benton hammering a nail into a wall, is unfortunately marred when the wall wobbles noticeably under Benton's hammer-strokes.

20ep 1-7 – This is a general problem throughout the story: Bessie's wheels are completely clean and dry inside the Doctor's hut, whereas the ground outside is clearly wet and muddy.

30ep 1 – Look at the "Nuclear Power Output" gauge in the TARDIS laboratory: "megavolts" is mis-spelt as "Megga Volts".

40ep 2 – This is a pretty general problem, but it's best illustrated by an instance in Episode 2. The first person to be turned into a monster by the primeval ooze is supposed to be red-hot (as are they all) — in fact, when he dies lying against a wall, the paint is blistered and burnt by the heat from his body. Yet his clothes remain completely undamaged, not even slightly bursting into flame!
[I don't suppose the BBC would have tolerated a children's programme containing a bunch of singed, greenish nudists running around menacing the cast...]

50ep 3 – Section Leader Elizabeth Shaw's wig changes noticeably between the exterior and interior scenes.

60ep 3 – During one particular scene in the alternate universe, Professor Stahlman calls Lethbridge-Stewart "Brigadier" instead of "Brigade Leader".

70ep 3 – As the Doctor escapes from the Brigade Leader's office, he runs past one of the control consoles, which is complete with that extra little orange-coloured panel that was used in episodes 1 and 2 to control the flow of power to the Doctor's experiments. What's this thing doing in the parallel universe, since the Doctor doesn't exist there?

80ep 3-5 – Jon Pertwee repeatedly mispronounces "continuum" as "continny-um".

90ep 6 – At the end of this episode, the Doctor's floppy bow tie is untied — but when he rematerialises in our dimension, his tie is, well.... tied!

100ep 7 – The climax to this story, while suspenseful, does leave a little to be desired in terms of credibility. Consider this: The Earth's crust is on average 25 miles thick, and the drilling went on for roughly 60 hours (we see the countdown timer in episode 1). Since the countdown was halted with 35 seconds to go, if we assume a constant drilling rate, that means the drill would have been about 20 feet from breaking through to the Earth's mantle when it was stopped. The problem is — shouldn't the huge pressures which exist in the mantle break through that scant few feet of rock by itself and cause the destruction of the Earth regardless?

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