Re: Bit roles before they were "famous"
Robert Duvall's first appearance was as Boo Radley in "To Kill a Mockingbird." He appears only at the end, but his off-screen character is referred to throughout the film (after all, Boo "is" the mockingbird the title analogizes to).
I also remember Duvall as an Evil Villain out to control the West on an episode of The Wild Wild West
('The Night of the Falcon', iinm, about 1967.)
Dinosaurs are just really, really big chickens.