Continuity mistake: When Munson is on the bridge right before he backs up to tell Ishmale he passed the test, he has a vision in his mirror of his nasty landlord. When the vision ends he folds his mirror up, but the next shot when he's backing up, the mirror is back to it's original position.
Continuity mistake: In the final match between Roy and Big Ern, Big Ern throws his second ball in the tenth frame and has removed his silver neck scarf thing, but when he turns towards the crowd, the camera angle that shows the back of Big Ern shows the scarf around his neck once again.
Continuity mistake: Roy puts down his sun visor in the car but it is up again in the next camera view.
Continuity mistake: When Munson is bowling at the beginning of the film he does the "splits" and the ball is spinning in 1 spot then the ball starts to roll again, in the next scene the ball is traveling at a higher speed than the scene before.