White Hole - S4-E4
Continuity mistake: Just after Kryten says what point in time he would like to return to, he is looking down and working with the screwdriver. The camera angle changes and he is looking straight forwards with the screwdriver on its side. (00:05:35)
White Hole - S4-E4
Continuity mistake: When the Cat and Lister are trying to cook an egg with a bicycle powered hair drier, you can see the Cat holding a frying pan. When Lister gives up and gets off the bike, Cat picks up a spatula with his other hand and starts poking the egg with it. However, in the next shot, he is shown with both hands on his hips. It's an instant cut with the same conversation continuing, so he didn't have time to put them down. (00:15:25)
White Hole - S4-E4
Continuity mistake: When Rimmer asks Kryten if it is the time of year his head goes for retuning, the shadow on his face changes between shots. (00:09:15)
White Hole - S4-E4
Continuity mistake: Kryten takes the computer slug out of the machine with his left hand yet in the next shot it is in his right hand. (00:20:00)
White Hole - S4-E4
Continuity mistake: When Kryten tells the toaster not to offer Lister any grilled bread products, Lister is looking down at the table behind him. In the next shot he is looking over his shoulder at the camera. (00:02:50)
White Hole - S4-E4
Continuity mistake: When Kryten & Lister are talking to the toaster at the start of the episode, Lister's locks disappear then reappear over his right shoulder. (00:01:55)
White Hole - S4-E4
Continuity mistake: When Holly is talking to the toaster and they say about currenty bread, the toaster's handle is half way down. In the next shot it is at the top. (00:08:00)
Suggested correction: Lister can only see M-Corp products and M-Corp employees. Cat is not an employee of JMC or M-Corp, so he disappears. Lister is the only member of the crew who is employed by M-Corp at this point.
Suggested correction: Cat was a descendant of the cat Lister brought aboard Red Dwarf. Would it be possible that the new owners might have stricter security controls, and Lister was sent to Stasis for a different reason?
Andy Benham ★
Inventing Deux ex machina explanations for a plot hole doesn't make it any less of a plot hole. M-Corp erases all of the Jupiter Mining Corporation's equipment, personnel and infrastructure from Lister's life. In no way is Cat a part of that. He has no connection at all to the Jupiter Mining Corporation, and until he meets him in Episode 1 no connection to Lister, either.
If M-Corp only erased JMC equipment from Lister's life, then Kryten, who belongs to DivaDroid and not the JMC, wouldn't have disappeared either. He disappears as he doesn't belong to M-Corp, not because he belongs to the JMC. Cat has no connection to M-Corp, as he wasn't a part of the JMC (as you pointed out), and is therefore erased for Lister.