Mostly what Lucas changed in the trilogy were technological stuff. New battle shot, new Death Star explosion, stupid crap in the background that no body gave a shit about anyway. That kind of thing. Even then he was basing a lot of his movies on niffty ILM shots (not that I'm ragging on the OT for that). But ESB was about heart, romance, and the internal journey. That sort of thing. You can't fix an inner monologue like you can a Tie Fighter blowing up. That is why it was pretty much left alone, except for the stuff that didn't need to be fixed (i.e. "Bring my shuttle......because I need it......since I'm going to my Star destroyer.....and I'm really pissed off.")

Oh and the DVDs from Nickelodeon were "Invader Zim." Nick really treated that show like crap. But at least they sucked up their pride and gave us the DVDs after they saw how mad us fans had become.