Here's some of the things I can think of at the moment...Damn, it is cool to be able to make suggestions this time out!
- Yoda is the first thing that I can think of where some tweaks are needed. Perhaps check out RoTS Yoda to see if you could do some subtle (cantina style) CG tweaks to his eyes, ears and face.
- In many of the scenes where Yoda is on Luke's back it's clear he is a puppet bobbing around lifelessly. I'm not sure if there's much you can do about that though? There is also a scene where he is walking back to his home which looks like it may be a midget in costume? Again I'm not sure if this can be helped.
- There are some common things that have already been mentioned such as Luke's saber sound in the cave, the saber colors, the somewhat rough looking taun-tauns.
- I can recall a few matte lines around the asteroids as well.
- I think the controversial decision is going to be whether or not to cut "the kiss". Judging by your restraint on AnH I'm guessing you'll leave it in. I'd vote for it to be cut out though. I look at SW as a Saga. If SW were a true Saga made in order it's just not something that would have been done.
That's all I can think of for now........