Red Dwarf

Bodyswap - S3-E4

Revealing mistake: During the Scrabble game, Lister (in Rimmer's body) jumps out of his seat and you can hear the chair scrape across the floor. As Lister is a hologram, he should not have been able to move the chair. (00:14:45)

Dwarf

Me2 - S1-E6

Revealing mistake: In the sleeping quarters when the cat is courting, he says 'If I believed that for one minute, I'd go crazy'. You can see Lister is mouthing the line. (00:10:50)

Dwarf

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Demons & Angels - S5-E5

Revealing mistake: After Starbug lands on the 'high' Red Dwarf, Rimmer is running out of power and starts to fade in and out. However, Cat, who must be standing too close to Rimmer also fades, the backdrop being partially visible through him. (00:08:05)

Back To Reality - S5-E6

Revealing mistake: At the very start of the episode, when the SSS Esperanto is seen, the bubbles from the seabed are sinking rather than rising, revealing the piece of footage is being played backwards. (00:00:35)

Dwarf

Back To Reality - S5-E6

Factual error: While it is true that lithium carbonate can be used to treat depression and other psychiatric disorders, it cannot be administered in gaseous form. It is a very stable salt and only starts to form vapour at 1,310 degress Celcius. Spraying it about as a 'mood stabliser' at that temperature, as Kryten does, is going to kill everyone on the spot.

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Chosen answer: In-universe, after leaving Red Dwarf after his first appearance, Kryten managed to crash Lister's space-bike into an asteroid. Lister found his remains and decided to rebuild him, however, due to the high level of damage and Lister's questionable repair skills, he was unable to recreate Kryten exactly, leading to changes in appearance, personality and accent. In reality, the original actor wasn't available, coupled with presumably practical concerns about one-off makeup as opposed to makeup for a regular cast member, so some visual changes were made.

Tailkinker

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