It’s Oct. 11, 1975, and the cast and crew of “Saturday Night Live” are scrambling to get the very first episode on the air. Director Jason Reitman (Juno, Up in the Air, Ghostbusters: Afterlife) chronicles those chaotic 90 minutes in his new movie, “Saturday Night.” He sits down with Tom to talk about how spending a week writing for “SNL” inspired the film, what it took to capture the excitement and tension of that night, and how truly revolutionary “SNL” was for its time.