Erich Pommer paid Heinrich Mann $8000 for the screen rights to his novel "Professor Unrat." The screenplay was then written by Robert Liebmann with Carl Zuckmayer contributing ideas, including the name Lola Lola and the Blue Angel Cafe. Josef von Sternberg insisted on the entire writing credit, claiming he had found the Mann novel on a dusty shelf and had directed the film from his own sketchy notes including the rooster-crowing sequence, and that he improvised much of the material during shooting.

Film

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