There's also a funny segment from the OT extras where Lucas is talking about the force, briefing what looks like a group of very bored Clone Wars series directors or some such. He talks about how the dark side is about wanting power, and how power is about possession, and how possession leads to fear and so on.
Which is funny, because Lucas is so possessive of his film, to the chagrin of his very own fans... And given that there's an entire documentary about the real-world stormtroopers...
Well... I'm just saying...