Thought this was an appropriate place to post, what with the mention of the split sabers, as I was capturing the ESBcommentary audio from my Definitive LDs that don't exhibit the split sabers in ANH when Luke gets given his saber, I noticed some split saber happening when Luke & Vader are fighting and Vader falls off the carbon freezing platform:

http://www.haku.co.uk/pics/StarWarsSplitSabers.jpg

That's some mighty weird grain removal side effect going on there... it's like the code is trying to anticipate where the lightsaber will be in the next frame but gets it wrong.