Duvall has not a single line of dialogue in To Kill a Mockingbird. He's on the screen less than three minutes, but he does more in those three minutes with less than most actors do in a lifetime. He's brilliant in it. I can name lots of folks in that film: Mary Badham and Phillip Alford as Scout and Jem (and yes, I'm doing this off the top of my head), John Megna as Dill, Brock Peters as Tom Robinson, Colin Wilcox as Mayella (funny how I'm remembering the character names, too, but that's because there's many pages devoted to the musical of Mockingbird that I wrote), Frank Overton as Heck Tate, Alice Ghostly and Rosemary Murphy, Ruth White, the great Paul Fix, William Windom - it was a GREAT cast, perfect, really. And the wonderful opening narration is read by Kim Stanley. One of my all-time favorite films.