I'd add Palaptine's true appearance to the list. Only because I used to think the way he looked in Jedi was from years of fully using the dark side, not from having Force Lightning turned back at him for three minutes.

If it was really scar tissue, then Luke ought to look pretty bad at the end of the film.

Any suspense of who the Dark Lord really is in the prequels isn't helped by Palpy's barely shadowed face. (It's also a darn good thing he has enough free time in a busy day of manipulating the senate to sneak off, throw the hood on, and hologram contact his minions too.) Clark Kent has a better disguise. ;)