Other mistake: In the library scene, the guards are harassing the inmate by throwing books on the floor to make him pick them up.One of the guards drops a book on the floor to tell the inmate that he missed one but when he comes back to pick it up he actually picks up 3 books.
Trivia: At the end, when Adam Sandler is walking towards the gate out of the football field and the warden is telling the guard to shoot him, it's exactly the same scene from the 1974 Burt Reynolds version.
Question: Who plays the guard that beats Adam Sandler with the baton? He looks familiar. He's also in the cafeteria scene - he attempts to hit Adam but he blocks it and then the guard says "You're gonna regret that" (or something to that effect).