There really aren't any scenes in the OOT that I dislike. The only thing that I would ever change in them would be to erase some of the matte lines- but that's it.
EDIT: I take it back- the scene in Jedi where they show the ewok getting killed- I hate that part. However, I still wouldn't change it. They HAD to show at least ONE ewok getting killed, I guess! LOL