Monogram signed Errol to appear as fight manager Knobby Walsh in the eight entries of their "Joe Palooka" sports comedies (1946–50).
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Most of these were marital farces in which Leon would get mixed up with a pretty girl or an involved business proposition, and face the wrath of his wife (usually Dorothy Granger); the theme tune to the series was the nursery rhyme, London Bridge Is Falling Down.
Leon Trotsky | León | Errol Flynn | Kings of Leon | Nuevo León | Leon Russell | León, Guanajuato | Jean-Léon Gérôme | Kingdom of León | Leon | Saint-Pol-de-Léon | Leon René | Leon Lai | Léon Blum | Leon Redbone | León, Nicaragua | Angelu de Leon | Province of León | Leon County, Florida | Leon Battista Alberti | León, Spain | Leon Panetta | Kings Of Leon | Juan Ponce de León | André Leon Talley | Oscar D'León | Leon Ware | Leon Morris | León Gieco | Leon Dewan |
He also made several musical short films featuring many bandleaders of the day; in the 1940s he also directed several shorts starring Edgar Kennedy and Leon Errol; he made his last film in 1946.