Corrected entry: In Quarantine Lister has been given a big dose of the luck virus. A few moments later Lister, Cat and Kryten are walking backwards down a corridor. Luckily Lister picks up the right parts for what Kryten needs, as he picks up one of the items he trips and manages to keep on his feet. With the luck virus still going through him he should not have tripped. The actress who plays Holly mentioned this on the DVD commentary.
Corrected entry: When Lister, the Cat and Kryten have spent 5 days in quarantine Cat's arm is broken and in a sling. However, at the end of the episode, Rimmer regains consciousness and the rest of the crew are wearing gingham dresses and making fun of him. At this particular scene Cat's arm is no longer broken. Don't broken bones take quite a while to heal? Unless Rimmer was in a coma.