all the wipes (a small point, but not insignificant, and anyway I liked the old ones better)
the snowspeeder matting on Hoth (this was arguably the only improvement in the SE, but obviously still wouldn't qualify as preservation).
The wipes would mean having to switch from DVB to LD just for one shot before and after the wipe, which I think would show up too much, or else using so much LD material that you may as well go the whole hog. Oh well, it was good for fifteen minutes.