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Robert Youngson's onscreen credit reads: "produced and written by." The entire film consists of edited clips from silent comedies. Youngson provides an offscreen narration throughout the picture. As noted in Youngson's narration, Leo McCarey directed and George Stevens photographed the Big Business short starring Laurel and Hardy, and Frank Capra wrote the sequence with Billy Bevan and the automobiles.
According to modern sources, clips from the following shorts, among others, were included in the film: the 1914 Keystone-Mutual production The Masquerader, starring Charlie Chaplin; His Tysting Place, a 1914 Keystone-Mutual film starring Mabel Normand, Chaplin and Mack Swain; Fatty and Mabel Adrift, a 1916 Keystone Triangle production starring Normand and Fatty Arbuckle and Teddy at the Throttle, a 1917 Keytstone-Triangle Production starring Gloria Swanson and Wallace Beery. When Comedy Was King was produced as a follow-up to the 1958 film The Golden Age of Comedy, which Youngson also produced.