Near the end, when Arwin is attempting to knock down the 7-10, you can see the 10 pin move slightly even though the ball hasn't hit it yet.
When Arwin is having flashback of bowling for the championships, you can see two girls in the background. In one shot, the girl with boots and jeans is in the front, and the girl with a jean skirt is in the back. In the next shot, they switch places. They continue to switch places throughout the flashback.