The French and German versions don't quite line up right. I think the French one is a few pixels left and one or two up from where the German one sits. The saturation's a bit different, too (the French is more saturated). Not too difficult to fix with AviSynth, but if you're just doing it for noise, I guess you'd have to consider the tradeoff against having to move stuff around.

Oh, and there are a few differences in the number of frames in each of the two versions. I think maybe one frame in ANH, a couple in RotJ, and I can't remember ESB. Again, easily fixed, but annoying to find.