While the changes are for the most part less drastic than for the other two movies, TESB has the changes that bother me the most of all of them. In case you care to know, I'll list them:
1)The music timing as the Millennium Falcon drifts away from the from the star destroyer. I always loved the music surge as soon as Chewie releases the landing claw. Changed for...no apparent reason?
2) As Darth Vader leaves cloud city, what used to be a terse, tensely uttered "Bring my shuttle" now becomes the most awkwardly long-winded and non-spoken-style English phrase, "Alert my star destroyer..."..UGH (also discussed earlier here http://originaltrilogy.com/forum/topic.cfm/Alert-my-Star-Destroyer-to-prepare-for-my-arrival-What-was-the-point/topic/10993/).
3)The whole shuttle sequence.... this interrupts the fast-paced, urgent timing of Luke's rescue with a REALLY slow, unnecessary show of military pageantry. Wouldn't Darth Vader, if he's in a hurry, not worry about making troops stand at attention as he does something as mundane as shuttling from a planet to his ship?
4) Probably the 2nd worse for me is the timing of getting Luke back into the Falcon - THere *used* to be a really rhythmically timed orchestra hit, then the door closes, then a little string and flute flourish, and cut away. Now there are CGI doors, lots of light, NO apparent regard to the music timing...it's less artful and more slapped-together feeling to me.
I've never heard anyone mention #1 or #4 beside myself - it might just be that I watched that movie a LOT as a 14 year-old with a new (Beta!) VCR in the house, or because I'm a musician, or because I'm an audio guy in general. But I find those changes pull me out of the movie so much that I can barely watch.