When Mikey backs the car out to drive to Elmira, he backs into a wall and we hear tail lights breaking. But when he arrives at the rehab facility, we can clearly see that the tail lights are intact.
When Angie and Mike are sitting at the breakfast bar, he lays the fork on the counter. In the next shot, it's already in the bowl.
When Angie and Mikey are arguing at the diner the people that were behind Angie disappear suddenly.
The woman tells Michael that Angie tried to pickpocket her husband. If Angie procured the wallet, then she didn't try, to, but did pickpocket him.
When debating his agent fee with Angie, Michael says of 10%, "It's the law). It may be industry standard, but not law.
Early on in the car, Ed tells Michael that he (Ed) is up to his ears in credit. Credit is a good thing. He means debt.
At the restaurant with Anie, Michael order a cheeseburger, large fries and a milkshake. He is given a large plate of fries with something indistinguishable but which looks like two fried eggs.
When Mikey says," He's wacky, he's wild, he's the world's favorite child...." at the beginning of the movie, when he hits the guys car with the puck, it is obvious that his lips don't match the words.