In early drafts of the script, Luke was a seasoned Jedi general, as well as a holy man from thousands of years earlier who discovered the Force.
2
There were two alternate endings to the trilogy, and much less happy ones. One has Luke dying and Leia continuing his mission as well as one where Luke puts on Vaders' mask and turns to the dark side.
3
Robby Benson and William Katt both auditioned for the role. Never heard of them? That's because they didn't get the role.
4
Robert Englund who plays Freddy Krueger was Mark Hamills roommate and alerted him to the role of Skywalker.
5
Hamill was in a serious car accident while he was finishing the first film, but according to George Lucas, they didn't add the Wampa attack to account for the changes to his face, as the urban legend says.
6
Skywalkers green lightsaber was inspired by Obi-Wans, and he created it on Tatooine, which you can see in a deleted scene.
7
During the idea stage, there was a sequence during the Sail Barge battle in which Lukes robot hand would be cut off and then it would crawl, by itself, towards the lightsaber it dropped.
8
Before Empire was released Hamill previewed the Cloud City costume in an appearance on The Muppet Show.
9
Luke Skywalker will just become one with the Force when he dies, just like Obi-Wan, Yoda, and Anakin, according to the Expanded Universe.
