Continuity mistake: In the scene where Moe shows the Tenor brothers their apartment, the star on the door is gold. Later when Morty is riding around on the scooter, you can see the star on their door has changed to silver. It changes many more times throughout the movie.
Continuity mistake: In the diner, when the camera shoots the twins from the other side of the table, a sugar bottle can be seen. However, when it shoots from Bob's side of the table a bottle of hot sauce can be seen (it should be seen from the other angle as well, but is absent). (01:16:50)
Continuity mistake: When they are getting on the bus after being turned down by some agents there is a guy with a red shirt getting on the bus. The scene cuts and shows the guy with the red shirt smoking but not on the bus. The other people in the shots are mixed up, too (the only one that stays the same is the girl Walt hits on). (00:25:15)