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.
Factual error: The "B" train which he is chasing normally runs on the right most track (there are 3 tracks on this particular line). The middle one is never used except for out of service trains. Most of the train stations on that line service the right or left track, not the middle one.
Trivia: The casting of Fernando Rey was an accident. William Friedkin had wanted to cast Francisco Rabal, whom he had seen in Belle de jour (1967), but at the time didn't know his name. Only after actor and director met did Friedkin realize Rey wasn't the actor he had wanted. Friedkin ended up keeping Rey after learning that Rabal spoke neither English nor French.
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