Okay, maybe we should move on to a different point of interest that hasn't been mentioned yet.

Lucas stated that the Emperor wasn't a Jedi (presumably, this included Dark Jedi, or what we now all know as a Sith). When did that change? It is revealed explicitly for the first time in ROTJ when he uses the force to undo Luke's binders.

I always kind of liked the idea of Palpatine just being a selfish politician who made himself a dictator, saw the Jedi as a threat, and manipulated one of their number into destroying them for him.