In retrospect, it’s almost unfathomable that a cast as strong as “The Godfather’s” could have been assembled. Marlon Brando, Al Pacino, Diane Keaton, James Caan, and Robert Duvall are all considered legends of the screen today, but back in the early 1970s, most of these actors were unknown and starred in the film for relatively low pay. And Brando, once Hollywood’s prince, was thought to be an unreliable, washed-up shell of his “On the Waterfront” self. Francis Ford Coppola, however, knew precisely who he wanted for “The Godfather,” and he fought for them tooth and nail, even in the face of Paramount executives who were intent on casting proven stars like Robert Redford and Ryan O’Neill. In Episode Five, Mark and Nathan talk about Brando’s legendary screen test, how Coppola ended up hiring real mobsters to star in the film, and why Pacino and Brando almost couldn’t join the film.