The "most recent biographies" of Tracy and Hepburn mentioned in this episode are William J. Mann's Kate: The Woman Who Was Hepburn and James Curtis' Spencer Tracy: A Biography. Other sources: Tracy and Hepburn: An Intimate Memoir by Garson Kanin; Lion of Hollywood: The Life and Legend of Louis B. Mayer by Scott Eyman; and City of Nets: A Portrait of Hollywood in the 1940s by Otto Friedrich. Special thanks to our special guests: Steve Zissis played Spencer Tracy; Kelly Marcel played Katharine Hepburn; and Craig Mazin returned as Louis B. Mayer.