skyjedi2005 said:

Were the seps misaligned or just missing a color layer?

I have heard of other restorations where either a layer was missing or was accidentally duplicated.

Is this why we have so much more dirt and grain than what was originally exhibited in 1977. Because they did a bad job?

At 51:20 :

http://www.dga.org/Events/2011/04-april-2011/George-Lucas-on-Star-Wars.aspx

.......Lucas says he went to Poland and Czechoslovakia to retrieve prints.

In other words huge chunks of the special edition are based off 35mm release prints.

Having watched the 2011 bluray upscaled to 4K it easy to determine 1st generation negs from dupe stocks.

The discrepancies have been equalized by DNR.