The Rescue:

10ep 1 – When the travellers are entering and leaving the TARDIS in the cave scenes, it's obvious that the police box shell has no back to it — the cave wall can be seen through the doors!

20ep 1,2 – Koquillion wears clawed feet in episode 2, but not in episode 1 (see, for example, the scene where he enters the spacecraft to confront Vicki).

30ep 2 – When Sandy (Vicki's "pet") is seen in its cave just before Barbara kills it, a stagehand is visible moving around behind it to the left.

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