One thing that i've noticed just recently is that at the start of the 2nd preview clip, purple dots appear on the jawas, then disappear. I checked on the blu-ray and its there as well. Are these on other people's Star Wars blu-ray transfers as well?
I find them distracting now that I know they're there so i've gone ahead and manually removed them using photoshop. I also noticed a similar thing when leia hugs chewie after they escape from the death star and blow up the tie fighters, blue dots appear out of nowhere then disappear, also from the blu-ray. I've gone ahead and removed them.
If anybody comes across any more, please let me know the timecode so I can check them out. I'm personally going to go through the whole film keeping an eye out for more to remove, so when I release this semi-specialised edition with a higher bitrate and Cinema DTS audio, they've hopefully all been taken care of.