Just Stuck It in That There Doo-Dad - S3-E3
Character mistake: At the start of the episode, Jimmy says he met Cookie at work. The scene then changes to the strip club where Cookie is working and Jimmy is there looking for Bobby. In the Season 1 episode "The Horny Bastard", Jimmy tells Cookie that they met when he robbed her dad's liquor store.
Annette Castellano Is My Nemesis - S3-E2
Character mistake: At the end of the episode, Danny says "Can we not do this in front of Bernard King?" referring to a poster on the wall of Danny's childhood bedroom. We can see the player in the poster is wearing the number 15 and is actually Earl Monroe, not Bernard King who wore the number 30.
Transformers (Lost episode) - S1-E7
Character mistake: When Donnie turns to the cameraman, Carl, and asks if he liked the film they just made, he responds in a normal American accent. Carl has been established in the series as German with a thick German accent, and the actor playing him, Rob, either forgot to use the accent or just didn't at that moment with them forgetting to change the audio in post. (00:03:55)