When they were promoting O Brother, Where Art Thou
(a movie starring George Clooney), the Coen brothers repeatedly claimed they had based the story on Homer's Odyssey
. Later they admitted that they'd never actually read it. Obviously, that doesn't relate directly to topic; it's just a tangent.
Also, Robert Comsol: I think everyone's seen Forbidden Planet
, but if you're going to divulge Shakespeare plot elements, you might want to call spoiler alert.