-Jabba would be changed from a fear-inspiring, loathsome crime lord into dim-witted creature, easly smooth talked by Han into getting a second chance
-Jabba hires only really stupid thugs to collect his debts who can't shoot someone only a few inches away
-Anakin would be more of a whiney brat than a heroic figure.
-A jedi can slaughter a whole tribe on innocent sand people,act only in his own self-interest, and kill Count Dooku in a rage, and yet not turn to the dark side
-Christopher Lee would be a sith lord (wait, that one was actually good)
-Obi-Wan wouldn't be taught by Yoda, like he told Luke.
-Vader wouldn't really hunt down and destroy any Jedi. Stormtroopers did most of the work for him in a sneak attack. Vader only killed a bunch of little kids in a few minutes who were all in the same place.
-Yoda goes from being a wise jedi master to a stupid, short-sighted fool who was mostly part of the problems of the old republic