I like the change to Anakin's force ghost at the end of Jedi. It makes sense and fits the narrative better. Especially if you take into account both what Obi-Wan and Yoda say about Anakin and the nature of the force. And while I like the Yub-Yub song, I'm pretty happy with the new ending song as well.
Only change that bugs me a bit is the dialogue change of Luke's on Dagobah when R2-D2 escapes the Swamp Monster. "You're lucky you don't taste very good" was amusing. "You're lucky you got out of there" just doesn't work as well.