TMBTM said:

This And the fact that the fans asking for Boba Fett to return ended with... well, Boba Fett kinda return, only shows one thing: Lucas did not have a "grand plan".

He wanted to please himself in TPM without thinking about the fans which I think was a couragous move even if I don't like much the result. But then why try to please the fans by removing Jar Jar and adding Fett? If "the plan" was for Jar Jar to be a better character in EP 2, I think it would have been better than watching Lucas trying to "fix" the story to please everyone, resulting a mess of a movie.

Going back to Qui-Gon not disappearing and Lucas saying he'd explain it in Episode II. Then all of a sudden, its 5 minutes before the last movie ends:

"George, remember how you said that you'd explain why Qui-Gon didn't disappear and Obi-Wan and Yoda do?"
"How dare you mention what happened in 'those movies' in my presence! But I suppose I should try... How about this. Yoda tells Obi-Wan that Qui-Gon figured out how to keep his individuality and be a ghost. There, done."
"But sir, how does that explain anything? Qui-Gon didn't disappear, that's the point. If Obi-Wan and Yoda had to disappear to become ghosts, why didn't Qui-Gon? And if Qui-Gon taught Obi-Wan and Yoda to do it after he was dead, how does Anakin show up as a ghost at the end of Return of the Jedi?"
"WHAT DID I JUST TELL YOU ABOUT MENTIONING THOSE MOVIES! That's it, fine, you know what? I'm going to replace Anakin in the third movie with Hayden, what do you think of that?!"
"How does that help-- what are you doing?"
"Choking you with the Force!"
"You know what, I quit."
"I'm going to make Chewie and Yoda best friends, what do you think of that quitter?!"

Not quite on topic, but it came to me just now.