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Remarkably, filming for The Night Porter took place in various locations, including Vienna and Rome, with some concentration camp scenes shot in the Tuscolano district. Cavani's passion for the subject matter stemmed from her earlier work in documentaries about the war, which informed the narrative choices in her fourth theatrical feature - a film that would gain international recognition.
While many of the supporting actors were dubbed to achieve a seamless sound quality, this technique remained unnoticed and contributed to the film’s overall impact. Notably, Rampling and Bogarde had previously co-starred in the controversial The Damned (1969), further cementing their chemistry in this provocative film.