Mos Eisley is the biggest reason I prefer the Original Untouched Trilogy to the SEs. What made ep. 4 so special was the lived in believability of the environments. It came from the European comic books Lucas was into (he has a copy of the book Valerian in his office which is a great Heavy Metal-esqe comic).

The original Mos Eisley looks run down, not alot of people, and overall dumpy. Its a very used looking Space Port. The special edition version is populated with CG characters that our eyes know are completely unreal. It takes us out of the scene and reality of the movie completely.

The dewback scene, which comes earlier, is similar. The Dewbacks in the background of the OUT are not moving but our eyes can't make them out that well so it looks real. The CG dewbacks are obviously animated so the reality of the situation is lost.