Unsatisfied with Riccardo Freda's first shorter cut, and deeming it too incomprehensible in narrative terms, the producers ordered Filippo Walter Ratti to shoot Bill's flashback featuring Irina Demick as his mother and the scenes with Paul Müller as the psychiatrist, so as to make the film longer and more straightforward. Freda's original cut supposedly ended with Lady Alexander driving away from the sanatorium into the mist.
Final film of Irina Demick.
As of 2023, the film has yet to be dubbed in English despite it's worldwide distribution.