Timeslides - S3-E5
Continuity mistake: In the pub, Lister gets a pint incredibly quickly after they arrive and has managed to drink half of it in a single camera cut. (00:11:50)
Timeslides - S3-E5
Continuity mistake: Kryten needs to ask what a pub is, yet in the episode "Backwards" he and Rimmer worked in one for three weeks as the comedy act "The Sensational Reverse Brothers", and, later, were involved in a brawl in the same pub. Originally, the episodes were to be shown in a different order, which explains why the mistake occurs, but doesn't excuse it. (00:12:55)
Timeslides - S3-E5
Continuity mistake: When Lister and Gilbert are looking at the statue of Lister in the courtyard, Lister has his arms crossed in an angle from above, but when the shot cuts back, his arms are at his side, before crossing them again. (00:19:25)
Timeslides - S3-E5
Continuity mistake: When Rimmer visits rich Lister, he apears from a point right next to him. But when he leaves, the point at which he disappears is much furthur back.
The Last Day - S3-E6
Continuity mistake: When Kryten throws away the breakfast, Lister's locks move from behind his shoulder to in front of it in a single cut. (00:01:55)
The Last Day - S3-E6
Continuity mistake: Lister's hands change position between cuts when Kryten walks out in the opening scene. (00:02:05)
The Last Day - S3-E6
Continuity mistake: When Kryten packs his spare heads away, he places the first one in the case with his left hand. In the next shot it has moved to his right hand. (00:03:50)
The Last Day - S3-E6
Continuity mistake: When Kryten is packing his heads away at the point where he says 'how would the manufacturers sell their latest model?' he is looking forwards. The camera changes angles and he is looking down. (00:04:00)
The Last Day - S3-E6
Continuity mistake: When Kryten takes the invitation from the skutter, he picks it up with his right hand. In the next shot it has jumped to his left hand. (00:10:20)
Continuity mistake: When Camille asks Kryten if they could make it, Kryten puts his glass down on the table. In the next shot, it is suddenly back in his hand, being put back down again. (00:22:35)
Continuity mistake: Lister enters with a tray with some food on to give to Kryten. The position of the tray changes position between shots. (00:10:10)
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