Yeah, I can see that very slight color change as Luke turns his head. It's not just Luke, or the building behind him, the color of the whole image seems to shift very slightly at that point. I think that might be one of those color fluctuations that Treadwell noticed way back in '97 upon seeing the SE in the cinema. I quote:

"The color timing was inconsistent; skin tones would go from pale to pink IN THE SAME SHOT. Most noticeable when Ben and Luke first meet Han."

So this could be a flaw in the SE film element, and not just with the color grading of the '04 transfer. Not sure what caused these issues in the first place - maybe it had something to do with the fading and deterioration in the negative, and when it was restored, the color correction/recovery made these problems stick out. (And of course, the '04 timing made things even worse...)