When Tommy's house is surrounded by police, the head officer can be seen wearing a watch with a black leather or rubber band, then a few minutes later, in another shot, he is wearing a watch with a silver band.
When Scolero first comes to Tommy's house to collect his debt, he is accompanied by two men: Brick and Hamstring. When the gangsters return, Hamstring is no longer with them, and has been replaced by another man who appeared in an earlier scene in Ralphy's garage.
Towards the end when Tommy is trying to persuade the other two to leave with him, there are three points in which Tommy's lips move out of time with what he is saying.