When Lister tips out some cigarette butts from the can of beer he's just drank, you can see them tucked into his hand that's holding the can, so they aren't really falling out of the can.
Yellow boom mic visible at the top of the shot of Lister, Petersen, Chen and Selby at the table in the disco after Lister says his uncle isn't dead yet.
Boom mic dips into the top of the shot for a split second when Kochanski's hologram says "It's Kochanski's body, it's Kochanski's voice".
When Rimmer keeps repeating "4691 irradiated haggis", Lister says "Rimmer, will you stop saying 4981 irradiated haggis and speak to me?"
Rimmer claims to be a heavy sleeper here, but this is disproven later on. In 'Dimension Jump' he was woken by Lister letting the closet door shut.