The Mutants:

10ep 1 – After the mysterious package arrives, the Doctor tells Jo "I couldn't open it even if I wanted to" twice in the same speech.

20ep 2 – As the Administrator comes in to talk to the Doctor, there's a very loud creaking noise from somewhere on the set.

30ep 2 – When Ky and Jo dematerialise in the transmat booth on Skybase, Ky is holding Jo in front of him. But when they rematerialise on Solos, they are facing each other, talking.
[This kind of mismatch happens several other times in the story, too.]

40ep 2 – Just after the Doctor stops Stubbs from shooting Varan in the herbarium, a boom mike drops into view in the top-left corner of the picture for several seconds.

50ep 3 – During a "firestorm" on Solos, we see Skybase being hit by flaming debris. But Skybase is in orbit around Solos, completely above the atmosphere where the firestorm is. (If any atmospheric storm were powerful enough to throw stuff into orbit, it would make the planet completely uninhabitable!)

60ep 4 – On several occasions, the movement of the cloaks worn by Varan's warriors reveals that their "Mutt" vertebrae are simply stuck onto their cloaks, not attached to their bodies.

70ep 4 – The ending of this episode defies belief. A hole in Skybase the size of the one Varan gets sucked out of should have caused a violent, almost-immediate depressurisation of the whole of Skybase. Yet Jo and the others can scramble their way to safety with just a slight breeze ruffling their hair — and the Marshal, despite being right next to the hole, manages to get out before them!

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