Can we answer with the prequels? They’re not Special Editions, but I can get the logic between pretty much every SE change.
You can’t get any logic out of this:
Probably this:
So,
Lizard-guys shirt changed from green to red is the current winner.
Obi-Wans new scream a close second. (it’s more obnoxious, but the color change isn’t even noticeable, making it more pointless)
This is still the score.