What a treat these were. I never realized how much unused footage appeared in the trailers back then. Heck, some of them (particularly in Empire) I think would have been better than what was actually used (Probot closeup, Han/Leia's reaction when meeting Vader). I hope that when Lucas eventually re-releases the trilogy again, we get a ton of deleted scenes and alternate footage. Personally, I don't see why they were left off here, unless it's to give us a good reason to want to re-purchase the "Ultimate Edition" DVD's in a few years.