Many of the troublesome scenes from the LPP are the dark ones. These do not have a lot of contrast in them.
In the preview, they are just cleaned. We are in the process of replacing them with better quality shots.
One of the major scenes was the sequence when R2D2 goes into the valley and gets captured by the Jawas.
This scene had a lot of artifacts, and did not compress at all in the preview.
Here is a higher quality version of that scene:
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http://www.dailymotion.com/video/k7MrXTpcHKKOwNbIeyj
Parts of this will be replaced in the next internal preview that we will release.
Team Negative1