Revealing mistakes: At the end of the movie with Maniac Cop chasing after the detective in a police car while being set on fire, you can see the safety goggles under his mask in several of the changing shots in this stunt scene.
Continuity: In the scene where Det. McKinney and Dr Fowler are reviewing the unedited video of the shooting involving Officer Sullivan, the dialogue from Officer Sullivan is not consistent with the dialogue from the original shooting scene from earlier in the movie.