Continuity mistake: When the virus starts to eat the potatoes, Rimmer picks them up from the pile just below eye level. In the wide shot it shows the potatoes are just below waist level and Rimmer would have had to lean much further away from where he was standing to get the potatoes from that height. (00:20:00)
Continuity mistake: When Bird-man loses his glasses, he is feeling his face. In the next shot both of his hands are on the floor. (00:25:40)
Continuity mistake: When the crew are backing away from Pete, the way they are standing changes between long shots and close ups. (00:26:10)
Continuity mistake: When Bird-man's boots drop to the floor, the crew are looking straight forwards. In the next shot they are all looking up. (00:26:45)
Continuity mistake: When Pete eats Bird-man, Bob is with the crew in the cargo bay. When they run away, Bob disappears. (00:27:00)
Answer: The cello is a large four-stringed instrument, which, when it is played, stands vertically on the floor between the player's legs (assuming they are seated). If it is to grow as large as the other instuments mentioned will, it would require a rather unseemly lack of femininity to be able to encompass it with the legs.
Rooster of Doom