I think the dianoga works as-is, it's SO alien that you really just don't know what's coming next. It doesn't look as hokey as that beak they threw onto the sarlacc either IMO.
I'm pretty sure that there was always 2 X-wings, a Y-wing, and the Millennium Falcon flying away from the blast of the Death Star, just that they used to move in a boring way.
The new Wampa scenes should go, they don't match the original ones very well IMO. The Wampa's cave looks like a tiny little corner of a small apartment in the new shots.
I think I read that the "vader choking the royal guards" scene was supposedly filmed with Vader choking regular Imperial officers instead. If this is true, then it should be CGI changed to Royals.