 Filming of The Wanderers began in September 1978, most of which occurred in the Bronx. Kaufman said that during filming, "[This] Puerto Rican motorcycle gang came pushing its way through the crowd; wanting to see what was going on", and "they pushed everyone aside". They walked away after bumping into van Lidth. The crew also encountered trouble from former members of the "real" Baldies, who complained the film portrayed the Baldies incorrectly, saying: "[The movie] is a lie! This was not a bad neighborhood. There was no crime, no robbery. Murder, yes, but no crime!" Rose Kaufman eventually told them to "fuck off", which nearly resulted in a brawl between the former gang members, Wahl and several other actors.
