When DaSilva and Fox are at the first Tram scene, they are wearing jumpsuits with Sergeant's stripes but wearing Detective's badges. Additionally, when DaSilva lands on the Tugboat, another person is in a jumpsuit with Sergeant's stripes but wearing a Police Officer's badge.
During the subway train chase, Wulfgar discards his female hostage and the camera follows him towards the next carriage in which a standing couple can be seen ahead of him. This is the same couple he subsequently shoves aside in his next scene after firstly passing through a further carriage.
During the opening sequence as DaSilva chases the mugger along the station platform, headlights of approaching trains from both directions can be seen. However, these disappear once DaSilva removes his coat belt to tackle the mugger.
At the beginning of the film, we see 174th Street as the station with a mezzanine and stairs to platform level. The actual 174th Street station in the Bronx has no mezzanine - the two fare control areas are at platform level.
Near the start of the tramway situation, DaSilva boards an ATAC copter from a near the East River south of the Queensboro Bridge and the Roosevelt Island tram, at approximately 40th Street. The copter is shown lifting off and beginning to head uptown (north) towards the bridge (also known as the "59th Street Bridge", which is north of 40th Street). The next cut is to a camera angle from inside the copter looking forward over DaSilva's shoulder, but the particular area of Roosevelt Island shown on his left is its *southern* end, suggesting that the copter is now coming *from* the north and is heading *south*. In the next cut, DaSilva says "go over the bridge", and the copter approaches it from the south, heading north again.
In one scene Pam says she flies Pan Am coast to coast. Pan American Airlines (Pan Am) only flew internationally from and to the U.S. To fly Pan Am between Coasts of the United States, one would have to leave the country at some point, land in a foreign country, and take another flight back.
When Deke is firing a revolver at the police target range, the paper target's holes face towards him as if a small explosion went off behind them (squibs). Also the wires that held and were used to detonate the squibs are seen hanging out of the holes. Real police bullets leave small holes in paper targets.
At the end, Deke shoots Wulfgar. Wulfgar falls backwards against a door that opens to the inside. Yet in the next shot, you see him outside as if he had fallen through the door onto the outside stairs. Since the door opens to the inside, this is impossible.