Easter egg: On disc 1 of the Red Dwarf series IV DVD enter the 'select episode' option. Before you reach the episode menu there is a sequence including a scutter which grabs a tape. When you see the scutter with the tape press enter and you will be taken to perhaps the best easter egg in all the Red Dwarf DVDs, the Red Dwarf actors actually having an easter egg hunt during the commentary recording session.
Easter egg: On disc 2 of the Red Dwarf Series IV DVD go to bonus features and enter the plain text menu. Press down until you highlight 'back' then press left to highlight the paddle from 'Meltdown'. Press enter to see the animated short for this series with Ed Bye, Rob Grant and Doug Naylor.
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.