Most car license plates in the movie have the "B" for Berlin taped to look like "P", after reunification standing for Potsdam, but not used in West Germany at the time.
In the US, the English -dubbed version was distributed under the titles "The Testament of Dr. Mabuse", "The Terror of Dr. Mabuse" and "The Terror of the Mad Doctor".
This film was based on Thea von Harbou's script for The Testament of Dr. Mabuse (1933). There were many changes made for this remake.