Continuity mistake: In the opening scene, just after the man is set afire he falls to the ground. Frank shoots him and while firing his weapon jams. A casing is stuck in the ejection port (called a stovepipe when it happens). After the round sticks he continues to pull the trigger and the weapon continues to fire.
Factual error: When Russell Crowe's character is standing by his car at the end, waiting to arrest Denzel, Denzel notices there are cop cars on either side of the block. When it goes to the shot of the cop cars on his right, a modern day sedan that is tan in color passes right by the cop cars. The problem is, this film is set in the 1970s. (02:32:15)manthabeat
Continuity mistake: When Russell Crowe and the other cop are chasing a crook through a hotel room, Crowe gets pinched in a doorway by the crook with the door. The crook starts to bite Crowe's hand, so Crowe signals the other cop to smash the crook's head through the door with a mallet. When the cop does, he uses the handle end, and in the next shot, when he's pulling the mallet out back through the door, it's coming out with the hammer-head end first.
Factual error: The camera pans from the opening of the subway tunnel to Lucas' street corner, which is shown to be on the intersection of 116th Street and 8th Avenue (in green with white lettering). This is impossible, as the Manhattan Valley Viaduct, which carries the IRT Broadway-7th Avenue Line, spans from 122nd to 135th streets, and does not do so on 8th Avenue. While there is a subway line under 8th Avenue by 116th Street (IND 8th Avenue Line), it is all underground and no such opening exists. Also, the viaduct closes several blocks north of 116th street, therefore you should not see any tracks. The corner that you see is actually W 135th Street and Broadway, as the viaduct exists only on Broadway in Manhattan. Also, the signs are green with white lettering. This was not so in the 60s-70s, as in the entire borough of Manhattan during this period, street signs were yellow with black lettering.
Revealing mistake: When the C130 is taxing on the runway (just ahead of the police search of the plane) you can see a C-17 in the background. The C-17 only made its maiden flight in 1991.