Mack Sennett and Buster Keaton on the set of "Hollywood Cavalcade" (1939). For this tale of the early days of Hollywood starring Don Ameche and Alice Faye, Sennett supervised the silent film sequences featuring Buster Keaton, and which were directed by Mal St. Clair, who'd co-directed two of Keaton's silent shorts. Ironically, Keaton was one of the few major silent clowns who never actually worked for Sennett during the silent era.
