Revealing mistake: Near the end of the episode, when Andy opens the front door to meet Baranski the loan shark, he leaves the door open behind him for the camera man.
Continuity mistake: When Michael is talking to Barry, Barry's hands change position with each shot. On the table, folded together, holding his glass, etc.
Chosen answer: It might not actually have one, in which case, he'd have to go down into the club and use theirs. As for showering, going to his mother's house or a gym membership would take care of that.
Captain Defenestrator