Two Guys, a Girl and a Vacation - S2-E2
Continuity mistake: In Two Guys, a Girl and a Vacation, Pete is drinking brandy with a man called Peter Faber. Peter Faber's glass is only a quarter filled, but a few shots later the glass is almost half full. It is impossible that he could have poured more into the glass, and the waitress couldn't have walked all the way down to the table in the few seconds it lasted for the angle to change.
Love Shack - S3-E21
Revealing mistake: In the scene at the fire station when Pete is cleaning the make-up from Annette's face you can see Annette holding the tissue that has the multi-colours on it and as Pete stands up you can see him grab the tissue from Annette.