Fresh Air's Dave Davies with Robert Duvall.
"The extras we got — they would come at 4 a.m. and stay until 8 p.m. — there were maybe 1,200 to 1,600 of them," he explains. "We got these extras where it was the first time they were in a movie. In Hollywood, they have the trade magazines and they come in, and ... there's a certain kind of jaded quality. [Whereas] these people were very fresh. They added a wonderful voice themselves to the movie."