Here’s my list of suggestions:

Maybe one less use of “my master” during the scene when Vader tells Palpatine about Luke being on Endor. To me, it sounds a little repetitive to hear him say that for two sentences in a row.
Either shorten or remove the scene with the scout troopers chasing the Ewok on speeder bikes.
Reanimate Palpatine’s Force lightning, and don’t give it as much of a glow.
When Luke takes Vader’s mask off, make the top of Anakin’s head less egg-shaped, but keep his blue eyes and leave the eyebrows off as shown in the official 2004 DVD onwards.