Although Cool Hand Luke did win an Oscar for best supporting actor, and there is a Luke Skywalker, with a cool hand (one could argue)...there are a couple of problems with your answers. Cool hand luke came out in the 60's, we are looking for a 70's movie. Luke (in cool hand luke) is a primary character (we are looking for a secondary character) and, in all due respect, i think the name Luke Skywalker comes from a different source (READ: The writer/directors last name)

But good try