In the scene where the boys are siphoning gas out of the bully's car, there is a shot of the three bullies coming out of the front door of the house. One of them slips on the steps, but the camera cuts to another shot just before we would have seen what was going to be a MAJOR landing on his rear.
Gunther's shirt changes from when they leave their old house, to when they get to their new house.
As Gunther does his paper round, the weather changes between shots.