Here is a subtle fx-correction made in the '04 DVD.

'77

In this shot when three Y-wings fly in a formation, one of the Y-wings suddenly disappear before going out of frame, this was finally corrected in the '04 DVD.

'04

I think all the wipes in the film was also redone, am I right? I'm not entirely sure if Luke's lightsaber was recomposited or not, it sure looks like it in some shots. I know they redid the training remote though. Have I missed any change? Maybe someone can fill in the rest if there is any.