Krushinski is just demoted from starting quarterback. He mentions to Molly that he makes a great slot back. The next scene is of a slot back making a great run, only the slot back is black. He gets tackled and when he gets up you see a very white Krushinski with the ball.
When Molly is racing the team around the track, Trumaine's pants are filthy. As he rounds the track, they are suddenly spotless.
The writing on the chalkboard behind Molly changes as she is giving her halftime speech during the Prescott game.
When Finch threw Coach Darwell in the mud at the end of the championship game, the coach lands on his back and then rolls around, but his face and the front of his jacket are already covered in mud before he rolls over.
Coach Darwell tries to put his hand down Finch's jock in search of money. Hundreds of people are watching. They would likely assume Coach Darwell is molesting Finch and call the cops.
When coach McGrath is taking the Jackson High School mascot, a goat, back to Jackson High School, although she is alone in the van, you clearly see a hand holding onto the goat's leg so he doesn't move around.
Whilst the team is exercising on the field, the shadow of the camera crew can be seen.