When Detective Simmons is in the library and goes over to the vent to investigate, the books on the top shelf go from being straight to being knocked over in between shots.
During the parade at the end of the movie, the police force is holding a banner that reads "Congradulations New Cadets". The first word is misspelled. It should be "congratulations".
The end credits state that the cast is listed "in alphabetical order". Usually that means that it's in alphabetical order by the actors last names. Here, it's listed in alphabetical order by the first letter of the character names.