Continuity mistake: Dabney Coleman and the villain fight on the scaffolding on the side of a skyscraper high above the city. They are the only two people on the scaffold, but during the fight at the bottom of the screen you can clearly see a man's head.
Continuity mistake: During the car chase, the bad guys are in front, followed by several marked police cars, then by the red unmarked car; they are all on a curved exit ramp (after the construction zone). In wide shots with no bullets hitting them, the marked cars are Dodge Diplomats, same as the unmarked red car. But in close-ups, when bullets are striking them, the marked cars magically become Chevrolet Caprices. This occurs at least twice. (VHS version.)
Continuity mistake: During the chase scene when the two cars are side by side down an alley, one car is scraping the guard rail and making sparks, but in the background the guard rail is still sparking with no car near it.