Continuity mistake: In the hologram simulation suite, the amount of smoke changes from cut to cut throughout the scene. (00:06:30)
Continuity mistake: When Lister and the Cat are on the moon, their casts keep appearing then disappearing. (00:15:15)
Continuity mistake: When Lister and the Cat put their sunglasses on, Rimmer's tie changes between camera cuts from over his shoulder to neat and straight. (00:18:00)
Continuity mistake: When Rimmer is talking about Lisa Yates to Lister, his tie is undone. When it cuts to the black box camera, his tie is correctly tied. (00:22:10)
Revealing mistake: When Lister and Rimmer are talking in the dome, the machine behind Rimmer keeps wobbling. (00:09:55)
Continuity mistake: When Marilyn Monroe waves to the Cat on the beach, in the next shot her arms are by her side. (00:16:50)
Stasis Leak - S2-E4
Revealing mistake: When the Cat gets jumped by the people in fancy dress, the red wall behind them wobbles. (00:17:50)
Revealing mistake: The square bluescreen outline can be seen in the wide shot of the obervation dome scene. (00:24:50)
Stasis Leak - S2-E4
Continuity mistake: At The End of the episode when the third Rimmer appears from inside the sink, the reflection of Lister on his bunk in the mirror shows he has a blanket over him. In the wide shot there is no blanket. (00:28:40)
Stasis Leak - S2-E4
Continuity mistake: When Lister puts his hand under his arm pit, his locks move from behind his back to over his right shoulder in one cut, and then back again. (00:18:00)
Stasis Leak - S2-E4
Continuity mistake: When the Cat attacks the 'dog' in the hotel, between shots it changes position as he jumps on it. (00:22:20)
Revealing mistake: When Holly is talking about his chess game, you can see his black clothing to the left of his chest, revealing he's hiding a body, and isn't just a computer generated floating head. (00:06:30)
Revealing mistake: During filming of the this episode, Craig Charles was called away for the birth of his son, Jack, so production manager Mike Agnew stepped in. Although Lister is wearing a space suit at the time you can still tell which part is Mike thanks to a continuity error - Mike forgot to put on Lister's plaster cast. (00:15:15)
Continuity mistake: Just before Lister says 'I'm going to give him Lisa Yates' he is looking forwards. When the camera angle changes he is looking at the Cat. (00:18:15)
Continuity mistake: When Lister is questioning how they can remake Casablanca, he is holding the video tape, but in the next shot, the tape has disappeared from his hand and is touching the control panel. (00:04:40)
Continuity mistake: When Lister is getting ready, he pulls his trousers off the table, causing the boot on the table to wobble. In the next shot, the boot is entirely still. (00:10:35)
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