Factual error: When Lt. Harris is being held hostage on the rooftop during the riot, his captor shoots a seemingly endless amount of rounds from a revolver, which should only have a maximum of six rounds. (01:26:06)
Suggested correction: He took both Copland and Blanks' revolvers, so he had 12 bullets. Even though we didn't see him switch guns, it doesn't mean he didn't at some point.
Continuity mistake: When the recruits are going to attend to the riot, Mahoney is on the bus wearing a brown uniform, as he has just been dismissed by Lieutenant Harris. However, later on, when he is rescuing Harris from the rooftop, he is wearing the regular uniform.
Suggested correction: Mahoney is always wearing the blue uniform; there wouldn't be two colors of a uniform, they're designed to match.