The year after this movie was released, Eleonora Rossi Drago attempted suicide (with gas). Additionally, adding to the film's reputation as "cursed", Pier Angeli killed herself in Beverly Hills that same year.
"Damaging" is misspelled on the opening title card: ...And Then A Violent Shock That Left a Deep Impression On The Mind And Damagen [sic] It Permanently...
The location (Torre di Cerrano, near Pescara, Italy) is the same of 'Delirium' (2002) cult movie by Flavio Sciolè.
Third to last film of Pier Angeli, followed by "Quell'amore particolare" (1970) and, finally, "Octaman" (1971).