When Lister and the Cat take refuge in the side vent from the water, Lister's dreads are over his right shoulder in the wide shots, but over his left shoulder in the closeup shot.
The bath that Lister has prepared for Kochanski has a bath bridge over it with a glass of red wine. The lights go out and they rush out of the room. When they return, both the bridge and the wine are no longer there.
Even though Kochanski was raised in the Gorbals, she has no Scottish accent unlike the earlier version.
Lister freaks out and panic when crawling through the vent shafts and is revealed to be suffering from claustrophobia. But, in Series 4's "Meltdown" when Lister and Cat materialize in the chimney of Adolf Hitler's base, he doesn't freak out or panic.
It is never explained where Kochanski gets all her clothing from. She did not have any baggage with her when was separated from her old crewmates, and it is unlikely Star Bug (as opposed to Red Dwarf) would have much in the way of clothing supplies on it.
During the water backwash scene, Cat and Lister are in a side vent yet the water rushes past them without any of the water entering the side vent they are in.
During Lister's first scene where he is unable to sleep because of the heat, his face is wet with perspiration yet his chest is completely dry.
'A sun' might be OK in certain situations for ordinary people, but in space-faring parlance, the correct term is 'star'.