Revealing mistake: As the gang is being chased through the "96th Street Station", you can see the true station name "Hoyt" (as in Hoyt-Schermerhorn Sts. Station) on the outer station wall. (00:42:50)
Revealing mistake: When Fox is thrown onto the railroad tracks in the subway, if you look closely at his legs you can tell that he stops in midair, meaning he obviously landed on something much higher than the tracks (boxes maybe).
Revealing mistake: When Ajax is handcuffed to the park bench and a cop punches him in the stomach with his nightstick, look at the police car behind the cop as he straightens up. The writing on the side of the car is backwards, indicating that the film was flipped to reverse left and right.
Revealing mistake: In the subway during the struggle between Fox and the cop, you can notice the stunt double in action instead of Fox.
Answer: The Riffs were informed of the Warriors' innocence of wrongdoing by a member of another gang who had no reason to lie on behalf of the Warriors or to frame Luther (the actual culprit). Apparently Luther had a reputation for dishonesty, among other things, whereas the Warriors were considered to be among the city's more "honorable" gangs.
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