In the final scene when Ralph is shooting the free throws after the foul, he steps over the line both times before the ball hits the rim, which means it would be a violation and the free throws wouldn't count.
The movie takes place in Ohio yet throughout the movie the weather is warm and leaves are on the trees which would not be the case in Ohio during high school basketball season. The weather should be colder with either rain or snow and with no leaves on the trees.
When Coach Roy and Preacher Don are both on screen, there is an obvious body double on the screen. When we see the back of Roy's head, the head is bald. But when the face is towards us, he has very short hair.