Errors made by characters (possibly deliberate errors by the filmmakers): At one point, Candy refers to an address in New York City on Houston Street (pronouncing it like John Huston or the Texas city). In reality, the street is pronounced "House-ton" - something known to every New Yorker.
Continuity: When Skip and Joey fight in the subway station, they are fighting in a cleared area near the ticket office and then the next two shots show them confined by exit railings near the newspaper stand and then the next shot cuts back to the open area.