Interesting thing that occurs to me: Thranduil's burned Phantom of the Opera face in The Hobbit is likely an idea Peter Jackson cribbed from George Lucas.

Lucas wanted to feature a disfigured Elf back in Willow--in the early story concept Sorsha was a blonde half-Elf, and she lost an eye in the film's final battle.

You could also compare the Elf version of Sorsha with PJ's invented character, the Elf warrior Tauriel. Given Tauriel's likely fate in the next film, Sorsha losing an eye suddenly doesn't look so bad.

This isn't the first time somebody else borrowed from Lucas's unused concepts for Willow, either. There was an idea Lucas had for a nude scene where Sorsha wears only a fabulously beautiful Elven necklace--a scene that ended up being recycled by James Cameron for Titanic.