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.
Mad Max
In a postapocalyptic future, jaded cop Max Rockatansky (Mel Gibson) is ready to retire. But his world is shattered when a malicious gang murders his family as an act of retaliation, forcing a devastated Max to hit the open road seeking vengeance. As he travels the Australian outback's empty stretches of highway, he tours the bloodstained battlegrounds ruled by marauding bikers who feed on violence.
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