Although I can find no information to support it, my theory is a young Edward James Olmos is the guy who picks up Mark Hammil’s character Kenny on his way to Las Vegas in the 1978 film, Corvette Summer. Imdb has a mysterious chararacter called “Uncredited” played by some actor named Rio, who doesn’t seem to exist, and Wikipedia/Olmos’ bio is silent on the subject. Sounds to me like this was before Olmos was serious about acting, and used a fake name. I don’t blame him for not taking credit, but I’m shocked I’m the first one to notice this obvious piece of acting history.
Be my guest, and watch the scene. Tell me this isn’t a young Adama giving a young Skywalker a ride.
The fact that Gandalf/Ian McKellan makes an appearance in this movie as a pornographer makes this claim even more plausible.
UPDATE: Well, after further investigation, the truth is revealed. It sure looks like a young EJO, but according to the Unofficial Corvette Summer site, that’s Isaac Ruiz Jr., who had a part on Chico and the Man.