As for the scene with Alderaan exploding, there's a clip from the dailies in Star Wars: Empire of Dreams where you can see the cut where the planet disappears and here the director yell "BANG!" as the planet explodes. I don't know if you recall, but I think it would be an amusing piece for the workprint, especially the "bang!" line for the "purist" version. And you can also add that Leia line that TK mentioned.
Another good bit of advice I have is that if there are lines of dialog or music pieces where the volume fluctuates, GoldWave has a great "Volume Shaping" tool that can remove fade-ins/outs and allow you to draw the shape of the volume for bits or even entire tracks.
