The Krotons:

10ep 1 – At the very start of the story, watch out for the sliding door which refuses to open.

20ep 1 – After the Doctor, Jamie and Zoe leave the TARDIS, they start to climb some rocks — but Fraser Hines comes down too fast and crashes into Wendy Padbury, who is thrown back several feet.

30ep 1 – Patrick Troughton is heard to say, "I don't think so, Joey... Zoe..." as they watch Vana and Eelek in the learning hall.

40ep 2 – When the Doctor and Zoe are being taken in to the Krotons, we see Jamie coming to stop them. The strange thing is, we see Jamie starting to run from a standstill, but supposedly he has just being running from somewhere else.

50ep 2-4 – Whenever the base of a Kroton is visible, it is usually possible to see the operator's legs causing it to bulge outwards as he moves it along. This is especially blatant when a Kroton emerges from the Dynatrope in episode 4.

60ep 3 – On location, the TARDIS lands in the middle of a large flat area, but in the studio scenes when the Doctor and Zoe go rock-collecting, a rock wall has mysteriously appeared immediately behind the ship.

70ep 3 – When the Doctor and Zoe are captured by a Kroton near the TARDIS, the Doctor picks up his bag of rocks so fast that one of them falls out with a clatter.

80ep 3 – Beta is left behind in his laboratory to make sulphuric acid, but shortly afterwards he mysteriously appears at Selris's side as the Gonds attack the Dynatrope's foundations.

90ep 4 – A gaping tear is visible in the right-hand shoulder of Zoe's jacket as she watches the Doctor being buried in the rockfall. In later shots, it's been repaired.

100ep 4 – When one of the Gonds (Thara) has his legs trapped under a rock, just before the Doctor and Zoe can help him he shifts his legs slightly and the "rock" wobbles considerably. It's then quite amusing to watch Pat Troughton and Wendy Padbury pretend the lump of polystyrene is heavy.

110ep 4 – While Jamie and Beta are making the sulphuric acid, at one point they walk backwards into each other. At this moment, Beta's face mask has slipped below his nose — but we then immediately see a shot from another camera in which the mask is in place again.

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