None of them really. A couple of Death Star battle shots from Ep. IV but the quality of those shots were so inconsistent with the original footage that it was more annoying to watch than anything else. Also scenes in Ep. IV that SHOULD’VE been changed weren’t, e.g., Ties chasing Rebs in the trenches. One moment Ties but no Rebs, next moment Ties fire and Rebs just ahead explode to kingdom come. I also hate the remastered look of the SEs. They look nothing like the films from their runs during the late 70s - early 80s. The contrast levels are nice but overall it’s just so damn revisionist.
When R2D2 goes through the Jawa canyon it looks really dark in recent releases. In early home releases that looked almost like day time. I forget, when did the home releases change that? If it was with the SE, then the SE actually get that MUCH, MUCH more accurate. Back in the theatrical release, it did look really dark when he went through that canyon and did not look vritually like day time as it had on TV and so many home releases for years.
Perhaps they already fixed that before the SE though, maybe for some earlier THX release or something?