Gary Oldman Herman Mankiewicz Amanda Seyfried Marion Davies Lily Collins Rita Alexander Tom Pelphrey Joseph Mankiewicz Arliss Howard Louis B. Mayer Tuppence Middleton Sara Mankiewicz Joseph Cross Charles Lederer Sam Troughton John Houseman Toby Leonard Moore David O. Selznick Tom Burke Orson Welles Charles Dance William Randolph Hearst Ferdinand Kingsley Irving Thalberg Jamie McShane Shelly Metcalf Adam Shapiro George S. Kaufman John Churchill Charles MacArthur Jeff Harms Ben Hecht Sean Persaud Tommy Bill Nye Upton Sinclair Rick Pasqualone Singer