“...They had to write the animal attack on Luke in that script to explain the scar on Hamill’s face in that movie, it was an auto-accident...”
THAT I did NOT know. I remember his accident, but I didn’t know they made it part of the script...
How do you find out all this stuff???
I learned this so long ago I couldn't tell you where I first heard it. Maybe a special on the making of the original series(first three). This one is fun trivia.
In January 11, 1977, a day before he was set to shoot one of the final scenes needed for Star Wars Episode IV: A New Hope, Hamill was involved in a car accident that caused substantial damage to his face. A double was used for the scene of Luke racing across the desert in his landspeeder while Mark was hospitalized.
.......
An in-universe explanation for his scarring was developed for Star Wars Episode V: The Empire Strikes Back where he is mauled by a Wampa, which seemed to be a pretty good way to many to allow him to continue, even with the scar.
Mark Hamill (Star Wars Wika)