Okay, simply put, even with Lucas' approval, the books are supplementary, not always the word of Lucas.
Yes, the books said Boba was actually a mercenary who modeled his suit after the Mandelorians, but I doubt Lucas gives a shit. Lucas wrote in that Boba Fett is Jango Fett's cloned "son".
As for why the Stormtroopers don't sound like Boba/Jango fett? They're not all clones. In fact, it's been known for a while that while some troopers are actually clones (like the one who whacks his head on the door to get the droids), most are not. A huge percentage of the clones were killed in the clone wars, and had to be augmented to feed the Empire's growing, ravenous hunger for power. Obviously the clone production ended with the death of Jango Fett. Apparently, the Kaminoans needed a live subject to continue the cloning for some reason. I have no clue. In any case, there are no new clones after Jango dies. If they hadn't needed him around, why did they basically keep him under lock and key, telling him he has to return after short periods away?
And for those who point out Leia's comment of "aren't you a little short for a stormtrooper?", that's easily explained. Even the US Military has certain height requirements for certain jobs. It makes sense that the Empire would have them as well. "5'6 eh? Sorry, too short to be a Stormtrooper. Maybe you can be cannon fodder instead".
So, while his accent should have been different, Boba's voice would have turned out fairly close to his "father"'s.
As for the seemingly ludicrous replacement at the end of ROTJ, I've heard one plausible (yet somewhat improbable) explaination. When you become one with the force, the force restores you to what you were like before you fell to the dark side, if redeemed. In Anakin's case, this would have been in his youth. Obi Wan and Yoda remained good guys 'till death.
I don't buy it, personally, since Anakin went to the light side before dying anyway. I guess it requires some sort of miracle or something.
I just wonder how much of a leap it's going to require in Episode III to get from longhaired, whiny-baby, terrible actor Anakin Skywalker to badass, voiced by James Earl Jones, Sith Lord Darth Vader. Supposedly, Hayden Christiensen whined to Lucas until he let him wear the Vader costume himself.
That bugs me a bit. 6'7 David Prowse played Vader in Episodes 4-6 (granted, once in a while his stunt double played him as well, not to mention the substitute face actor in ROTJ). Hayden is a very humble 6'1. 6" makes a huge difference. I'm 6'1, and I know several people taller than me. I'm not imposing. Not even in full Darth Vader regalia could I be imposing. They're gonna have to put Hayden on stilts to make him imposing next to Obi-Wan. Even the 3" Hayden has over the 5'10 Ewan McGregor is not enough to even out the difference seen between the 5'10 Alec Guiness and the 6'7 David Prowse.
At least they got the right height for Obi Wan.
Onto more pleasing changes in the series.
I love that they replaced the Emperor in the newest version with the man who now plays Palpatine. I like the subtle digital corrections done on several lightsaber scenes. I also like that the whole thing has been cleaned up, the sound has been fully restored and brought to its true 5.1 surroundsound quality. I love the fact that Lucas edited out Luke's girly scream when jumping off the rails in Bespin. He was escaping, not falling to his doom. He partially fixed his error with Greedo shooting first, making them shoot virtually at the same time and making Han Solo's movement to the side less distracting. I like the new version of Jabba in the "restored" scene in Episode 4. Nothing will make it perfect, but he did his best in making it close.
One thing he thankfully didn't take out is the supposed "nip slip" scene in ROTJ. I've taken screens from this and decided, there's no nipplage anyway. The Twi'lek is wearing a bodysuit under the outfit anyway.
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