CP3S said:
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.
It was basically established in ESB when the Emperor contacted Vader that he was a Force user of some sort, hence the slightly baffled Kasdan:
Kasdan: Was he a Jedi?
Lucas: No, he was a politician. Richard M. Nixon was his name. He subverted the senate and finally took over and became an imperial guy and he was really evil. But he pretended to be a really nice guy. He sucked Luke’s father into the dark side.
Kasdan: The Force was available to anyone who could hook into it?
Lucas: Yes, everybody can do it.
Kasdan: Not just the Jedi?
Lucas: It’s just the Jedi who take the time to do it.
Well, the Emperor certainly took the time to do it - "There is a great disturbance in the Force." (it could of course be argued that he just wasn't a Force user back when he snared Anakin)