Case in point - the eventual distruction of the Jedi and the balance of the force. People usually take it as 10 jedi = 10 sith, balance. At the time of TPM you have the council talking about Anakin bring balance to the force as if it was needed. Do they really want 10,000s of Siths to match up the Jedi Knights? I doubt it. They say that the Sith were gone and were pretty please with themselves. Why were they so enamored with this balance notion?
And what was the actual balance anyway? The Jedi in the movie believed it to be a numarical thing. All the jedi/0 Sith means balance to them. Okay, whatever.
But what I really think the whole point of the Balance was a moral level. At the time of the Old Republic the Jedi had become rather full of themselves. The Sith had been gone for 1000 years and they were now the cream of the crop. They took infants away and trained them in the ways of the Jedi. I doubt they stole any babies but I'm sure tremedous presure was placed on the family to give up the child. This child never saw or heard from his parents again.
Jedi are forbiden to own anything, love anyone, or have a family. Anakin showed how distructive this thought process can be. Had the Jedi simpley allowed marrage none of this would have happened.
Now by the time Luke comes to the scene, things have changed. He isn't the last of the old, but the first of the new. Jedi can get married, have kids, and basically have a life. That is the true balance of the force. A Jedi's life and sense of duty is now in balanced.
Of course, you have to dig down deep in the PT to get any incling of this theory and most of it is just speculation. But if this was a point Lucas was trying to make in the PT it didn't take. No one got it. Only the few film archeologists with too much time on their hands could gleen this.