Out Of Time - S6-E6
Visible crew/equipment: At the start of the episode, just before the Cat says his fridge free diet line, a boom mic shadow can be seen on Kryten's head and shoulder. (00:02:50)
Out Of Time - S6-E6
Continuity mistake: When Lister and the Cat wake up from stasis, Lister walks over to the computer and his locks are over his right shoulder. In the next shot they have disappeared. (00:12:50)
Out Of Time - S6-E6
Revealing mistake: When the crew go through the unreality pocket that makes Starbug disappear around them, part of the Cat's face disappears into the background. (00:12:05)
Out Of Time - S6-E6
Visible crew/equipment: When the Cat becomes visible again after going through an unreality pocket, the shot changes to a wide shot of the crew. A boom mic can be seen to be pulled out of shot at the top of the screen by Kryten's head. (00:11:40)
Revealing mistake: When Legion gets hit, you can see his real face for a second when he adjusts his mask. (00:21:30)
Emohawk - Polymorph II - S6-E4
Visible crew/equipment: When Rimmer says the oxy-generation unit is destroyed, a boom mic shadow can be seen on the crate in front of him. (00:09:40)
Out Of Time - S6-E6
Visible crew/equipment: When Kryten bends down to pick up the xrays, a boom mic shadow can be seen on the top of his head. (00:05:00)
Out Of Time - S6-E6
Visible crew/equipment: In the scene just befoe Lister & the Cat go into stasis, a boom mic shadow can be seen moving on the desk in front of Rimmer. (00:12:20)
Out Of Time - S6-E6
Visible crew/equipment: When Kryten walks into the cockpit to offer Lister a beer, a boom mic can be seen at the top of the screen by Kryten's head. (00:10:05)
Gunmen of the Apocalypse - S6-E3
Visible crew/equipment: Just after the simulant beams aboard and Lister and the Cat sit up from the table, a boom mic can be seen at the top of the screen. (00:07:40)
Gunmen of the Apocalypse - S6-E3
Continuity mistake: When Lister says the escape pod is not an option, his hands are apart in front of him. In the next shot, they are together. (00:12:20)
Emohawk - Polymorph II - S6-E4
Continuity mistake: Just before the damage report machine explodes, the room is full of smoke. As it explodes, all the smoke is gone. (00:07:40)
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