Stanley Kubrick and Crew Shooting Final Scenes of '2001: A Space Odyssey,' 1968
Kubrick is what many would consider a mad genius. He’s infamous for shooting an insane number of takes for each scene, sometimes 50, 60, or more for reasons that weren’t totally clear to the actors.
For example, Harvey Keitel was originally in Kubrick’s final film, ‘Eyes Wide Shut.’ After shooting a scene dozens of times and not receiving feedback as to what Kubrick might want done differently, Keitel essentially said “to hell with this” and walked … from a Kubrick film!
Also, the ending to ‘2001’ has always been a topic of much debate. There’s actually a recorded phone interview with an Asian reporter in which Kubrick specifically explains the ending, so if you’re feeling both curious and adventurous, go ahead and track it down on Youtube.