- Simultaneously shot in two versions (English and German) with the same cast; the German (with English subtitles) version is more popular because of the heavy German accents of the cast in the English language version. English lyrics for the songs were written by Sam Lerner.
- There is an Italian edition of this film on DVD, distributed by DNA Srl: "L'ANGELO AZZURRO (1930) New Widescreen Edition + BERLIN ALEXANDERPLATZ (1931)" (2 Films on a single DVD, with "L'angelo azzurro" in double version 1.33:1 and 1.78:1), re-edited with the contribution of film historian Riccardo Cusin. This version is also available for streaming on some platforms.
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