Continuity mistake: When the drug tester gets done with testing the heroin, he blows out the lit candle on the bottom. But when there is a far shot of him talking, the candle is still burning.
Continuity mistake: At the beginning of the film in Brooklyn, it is obviously dark outside (nighttime). As they are chasing the guy from the bar, it all of a sudden is during the daytime as it is light outside.
Continuity mistake: During the car chase scene under the "B" Elevated Train in Brooklyn (86th St.), Popeye passes the same curve at least 3 or 4 times. Look closely, you'll probably see the same movie theatre over and over again. Apparently, they rerun the same chase clip to increase the length of this scene.
Continuity mistake: During the car crash scene, the Commanding Officer, Popeye, Detective Russo and the other cop are walking toward the accident. Close shot of Popeye, as he says, "I say we keep sitting on Boca", and they all stop walking. Immediate cut to long shot, and they are all still walking toward the accident. (01:05:41)
Continuity mistake: During the subway chase scene, Popeye's car loses about a half dozen hubcaps! The hubcaps are back in place when Popeye parks the car at the end of the chase.
Continuity mistake: At the start of the movie in France, we see an undercover French policeman shot by Pierre Nicoli, if you look quickly when the policeman is shot, we can see blood splatter all over his face. However, when we see the wider shot of him falling down his face is clean and has no blood on it at all.
Continuity mistake: When Popeye is tailing "Frog #1", he waits outside while the Frenchman eats a long lunch in a restaurant. At first, we see the Frenchman sitting in an interior seat, with another table of diners to his left. But by the time dessert is served, he's at a seat by the window.