There apparently were no other actors in Hollywood.
“That was so weird about James Dean,” Mann said.
“It was a brilliant screenplay.

Michael Ochs Archive/Getty; Terry McGinnis/WireImage
And then it’s who the hell could play James Dean?
And I found a chap who could play James Dean, but he was too young.
We did a screen test that’s quite amazing.
I think he must’ve been 19 at the time.”
“And from one angle, he totally had it with him,” he continued.
“I mean, it’s brilliance.
He respectfully undid the James Dean bio for me.”
But for Mann, it was either DiCaprio or Dicapri-nofor his Dean project.