Shot under the title "Mind Games."
Almost all of the dialogue was rerecorded in post-production. Frank Wolff and Erika Remberg dubbed their own voices.
Specific scenes in the script were precisely written to take place in particular areas in the castle main location.
The sequence with Silvana Venturelli and Paolo Turco running outside in an olive grove was filmed over the course of two days.
Warhol called it "kinky".