Harrison Ford and Billy Dee Williams, ie: Han Solo and Lando Calrissian respectively...years before Star Wars.
Gary Busey appears as a vegetable-throwing hippie protestor.
Burt Reynolds and Harrison Ford would both have a career breakthrough (that would make them A-list superstars) seven years later: Burt in Smokey and the Bandit (igniting a six year box office reign) and Ford in Star Wars (basically making him a living legend).
Gary Busey plays a hippie protester, Hippie #2, to Anthony Geary's Hippie #1. And not only does it literally sound like Busey's voice was dubbed (as most outdoor scenes are), it sounds very similar to Geary's.
Ironically, Harrison Ford plays the wrong man character, accused of killing a beautiful woman and interrogated like he would be years later headlining The Fugitive.