It looks like San Francisco Rentheads have a shot at being in the movie. Below is the website for the agency casting extras for it, and they're hiring non-union people. Here's an exerpt detailing what they're looking for - there's a lot more info on the site:
"We have an immediate need for the following types:
ARTIST, BOHEMIAN & MUSICIAN TYPES: Men & Women, all ethnicities, 18-35, in shape, with an edge or interesting look for various scenes set in New York City during the late 1980’s. Think the Ramones, Clash, Velvet Underground, Blondie, Joan Jett! We’re looking for retro, early underground, alternative-punk types, cool but barely making the rent in the East Village, NY (NOT California dreaming in Malibu). *If you have a car that is from 1975-early 90’s that is a plus and you can earn a little extra $$$.
STREET PEOPLE, JUNKIES, DRUG DEALERS, PIMPS AND STREET WALKER TYPES: Men and Women, ALL ethnicities, 21-50s with interesting, character looks for various scenes set in New York City during the late 1980’s.
GENERAL EXTRAS WITH CARS: Men and Women, all types and ethnicities, 18 to 65 years. We may need YOU or JUST YOUR CAR. Your vehicle must be manufactured 1975-early 90s. Car must be in decent condition, run well, and quietly. You must have a valid driver’s license, and a clean driving record. NO RED, NO WHITE, & NO CONVERTIBLES will be considered."
Beau Bonneau Casting