Factual error: The justice computer states that Rimmer is guilty of 1,167 counts of 2nd degree murder, each carrying a sentence of 8 years, giving a total of 9,328 years. This is equivalent to 1,166 counts. 1,167 counts would be 9,336 years. (00:14:00)

Visible crew/equipment: When the crew are standing before the Judgement computer (when Lister is worrying that he will be sent to prison) if you look above Lister's head you can see a microphone bob up and down into shot. (00:11:10)
Revealing mistake: When the simulant pulls the knife out of his chest, you can see the knife is a dummy. As the handle is pulled back, the blade does not move at all. (00:25:30)
Revealing mistake: One of the escort boots passes through a wall as it goes round a corner. (00:10:10)
Other mistake: Rimmer's long-service medals are absent from his ceremonial uniform during the trial. 17.15. (00:17:15)
Suggested correction: This can't be classed as a mistake. It's not known that it's a requirement for them to be worn during the trial. Or maybe Rimmer couldn't find them.
Continuity mistake: When Lister sarcastically thanks the Cat for visiting him, Lister looks forwards, but in the next shot is looking at the Cat. (00:03:35)