For all the vocal hatred of the changes that George Lucas had made to the original trilogy, I still think there's somethings that it actually helped with or improved. Bear in mind this is all just MY opinion.
5- Jabba the Hutt in A New Hope
Some people are very divided on this. I personally think it adds a nice little arc to things. It's not perfect... but it does paint a clearer picture of how Han basically sacrificed his one chance to get in good with Jabba again (who was pretty approachable and willing to overlook transgressions at this point). So not only did he NOT take his crimelord boss the demanded money, but then joined with the Rebel Alliance... a group clearly not in the good graces of the fat slug.
I guess I felt it added a bit more depth this storyarc/subplot.
4- The Increased Number of Dewbacks
One of the most frequent complaints about this scene is the confusion as to why the Empire, a technologically advanced army, would use "fat desert iguanas". It just hit me as being practical, and really plays up the "Tatooine Sucks Ass" vibe that you're clearly supposed to get. Even for those Stormtroopers stationed there, their supplies are bound to run thin pretty damn quick on a desert planet known primarily for "Scum and Villainy" (not to mention tech-thieving Jawas).
And who knows? Maybe Dewbacks are like bloodhounds or something.
So to me it was always nice to actually see an increased role for these previously obscure creatures outside of odd background fodder. It also shows that the Empire was taking this situation more seriously than sending out barely THREE guys to investigate the Escape Pod landing site with such precious cargo.
3- The Big Party in "Return of the Jedi"
I guess I was in the minority of folks who thought the original 'goofy music' played during the Ewoks Victory celebration was really frikkin' dumb. Turns a triumphant scene into "Zip! Boop! Boing! Derp!", one last bout of goofiness to wring out of those damn Ewoks. This immediately following Vader's somber funeral pyre also didn't help either.
The improved music lends a bit more seriousness to this moment, and the scenes from other planets that were celebrating the (main) collapse of the Empire's stranglehold made it feel like a much larger event than just having the six or seven main characters rejoicing amidst midget bear aliens. The only problem I personally have with it is the post-prequels decision to add stupid Jar Jar in one of those scenes, front and center.
I'm perfectly happy with the idea that he was instead placed in carbonite by the very Empire he had (unintentionally) helped create.
2- The Wampa
The one movie in the trilogy that has had the least number of changes, I personally liked the more present addition of the Wampa. Always felt it was weird that we never got to see more of this thing, (outside of jump cuts and short clips) when just about EVERY creature in the series tends to be given ample screen/face time.
1- The Writing/Text
A rather clever thing that was changed was the writing and text in the Star Wars universe. Previously it was all in English, which doesn't make a lick of sense seeing as how this is not only in a 'Galaxy Far, Far Away' but also takes place "A Long Time Ago". So it was a neat little trick of 'world-building' by replacing it with a language that's as alien as the worlds that are shown.
Sure it's a small detail compared to the rest, but it's one that just ADDS to everything, and not in a blunt or offensive way.
Sarlacc Pit: One of the really appreciated additions (IMHO) was the change of the Sarlacc Pit from "Spikey Desert Anus/Vagina" to some weird tentacled monstrosity with a beak. Also gave the Sarlacc a bit more active role at some points in the big skiff battle... adding some extra intensity to the proceedings. Just made it seem more alive than before, and the tendrils suggested it wasn't just sitting there waiting for something stupid to get too close.