Future husband and wife more than 17 years after the making of this film, 'Karlheinz Böhm' and Barbara Lass, then respectively married to actress Gudula Blau and movie maker Roman Polanski, met on the shooting of this film.
Jacques Deray - the director - confesses in his biography that the production crew had to get the local Yakuza - Japanese mafia - authorization to shoot in certain districts of Tokyo.
This movie has never been based on an Auguste Le Breton's novel, only a script, a screenplay.