Other mistake: During the breakfast scene, Sgt. Botnick tells Andy he needs a trim on Wednesday, but he had just given him a haircut the previous day.
Other mistake: Chucky cuts Andy's Achilles tendon from under his bed. Throughout the rest of the movie, Andy should have a limp from such a severe injury. However, he has no trouble walking or running in subsequent scenes, nor does he show any signs of injury.