Continuity mistake: In the scene where Michael asks Joey and Gina to leave the bar, when Joey has gotten up and left and Gina is looking in the mirror, her pink handbag is in her right hand. Yet when the shot changes it is suddenly is in her left hand.
Continuity mistake: When Joey and Michael are talking to Roger, and everyone is drinking shots, when Joey and Michael put their glasses back down, we see that they're both on the tray, yet in a later shot, we see one of them is not on the tray any more, but further along the table.
Continuity mistake: When Michael is happy about Gina dating, we see Joey celebrate as well, he throws his hands in the air and when they come back down, they are apart, then when the shot changes, they are interlocked. Then when Joey points at Michael, he does it with his left hand and when the shot changes it is with his right hand.