The film also featured John Ericson, Louis Calhern, Edmund Gwenn, S.Z. Sakall, Betta St. John, John Williams, Evelyn Varden and John Hoyt.[.....] The film was directed by Richard Thorpe (who replaced the original director, Curtis Bernhardt) and produced by Joe Pasternak. The screenplay was by Sonya Levien and William Ludwig and was based on the operetta The Student Prince by Sigmund Romberg and Dorothy Donnelly which was in turn based on the 1901 play Old Heidelberg by Wilhelm Meyer-Förster.... (Read more at Wikipedia.)