George Clooney 'Wanted More Jonah' Hill in Latest Film 'Hail, Caesar!'

— -- At the heart of the Coen brothers' latest film, "Hail, Caesar!” George Clooney plays a self-centered, shallow movie star.

"Literally, every time they call me, it's like, 'Well, we got another knucklehead for you to play,'" Clooney told "Good Morning America" co-anchor Nick Watt. "I'm like, 'Thanks,' and then, [they'll say] 'Hey, we wrote this with you in mind.' ... I read it, and he's an idiot."

Co-starring alongside Jonah Hill, Clooney admits that while he loves the movie, he "wanted more Jonah."

Jonah Hill said, "I have a really, really small part. They actually got to work with me the more they saw that I work better in incredibly small doses."

Josh Brolin is a studio fixer in this tale from Hollywood's Golden Age, while Channing Tatum's character tap-dances in a sailor suit.

"We were in the airport and we both were trying to, like, you know, humble-brag to each other," Hill said of his co-star Tatum. "We were like, 'Yeah, I just got off the phone with the Coen Brothers.' We both were trying to brag, but it was the same movie."

"Hail, Caesar!" opens in theaters Friday.