It's interesting to see various people in the role of Han, Luke and Leia.
Available on the newgroups:
The only ones that stood out as castings I could see being possible alternatives are Kurt Russel as Han and William Katt as Luke although I'd still take Harrison Ford.STAR WARS - The 1975 Casting Auditions
A long time ago, in a galaxy far, far away…
Shot back in 1975 at the original Lucas Studios with a Super-8 camera, these are
the highlights of the original casting auditions from Mark Hamill, Carrie Fisher
and Harrison Ford. You'll also see what may have been if Kurt Russell, William
Katt, Linda Purl, Robbie Benson, Cindy Williams, Terri Nunn, Frederic Forrest or
Amy Irving had been cast as our beloved Han Solo or Princess Leia; even more
amazing are the audition scripts that are used for these screen tests as they
include dialogue from the original 'Journal of the Whills' draft.
William Katt is the actor from the Great American Hero.
Youtube has the casting...all of them shot on very bad Super 8 quality tape:
Hark Hamill and Harrison Ford:
http://www.youtube.com/watch?v=lSjP2GBTr9U
William Katt and Kurt Russell:
http://www.youtube.com/watch?v=79XY3d6-tiY
Robbie Benson as Luke:
http://www.youtube.com/watch?v=tv6jQvzpG0w
Terri Nunn as Leia:
http://www.youtube.com/watch?v=KXy59jMqOsc
Carrie Fisher: (audio out of sync)
http://www.youtube.com/watch?v=kCXrGuLix7M
Cindy Williams as Leia:
http://www.youtube.com/watch?v=8Ob-k0Rr6Fg
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Some funny speeches during George Lucas' lifetime award show:
William Shattner
http://www.youtube.com/watch?v=MDIBchVxSmE
Carrie Fisher Roasting George:
http://www.youtube.com/watch?v=lZ97s396kb0