Most of the extras used in the film were paid in beer.
The "get-out-of-jail-free card" that Goose gives the triker was an on-set joke. Because of the limited budget, the biker gang was an actual biker gang (the Vigilantes), and they had to ride to the set each day in-costume; often with their prop weapons displayed. Since the production company expected them to be pulled over by the local police, each was given a letter explaining the film's peculiar requirements, and asking for law-enforcement's understanding and cooperation.
Tim Burns (Johnny the Boy) was so into character that he annoyed everyone on-set, and was abandoned one day during lunch while handcuffed to the wreck.
James McCausland: The bearded man wearing an apron in front of the roadside diner watching the police cyclists and tow trucks drive away is the film's co-writer.