When Chuckie is being held in the warehouse, the rope moves around in between shots. Also in one scene it is wrapped around him five times, but in every other scene it's wrapped around him four times. He very obviously is untied and tied up again in between shots.
Chuckie follows four kids on his bike to the river jump. He stops and they go on without him. When he goes back and finally jumps, the tracks left by the other boys in the mud are different.
Chuckie falls into the river. When Bingo rescues him, his bike is in a different place in the river.
When Chuckie sees Bingo for the first time, he has not yet put his jeans on when he walks past the hanging clothes to meet him. In the next shot, he is wearing the jeans but not his shirt. The following shot, his shirt is suddenly on, too.
When Duke, the dog-butcher, comes to get one of the dogs out of the cage he leans his giant meat cleaver against Bingo's cage. When he hears the waitress screaming he puts the dog back in the cage and the cleaver has disappeared.
After Bingo pulls off all of Chuckie's clothes, in one shot you can see Chuckie wearing underwear.
When Bingo makes it to Green Bay and is in the bar, he uses a phone book.
The area code is 661 which not for Green Bay but for California's Kern County.