Brad Harris introduced the idea of a car chase by the end of the adventure, to perform another stunt.
According to his autobiography Kinski Uncut, Klaus Kinski had an on-set affair with actress "Beatrice Benito" (clearly Dominique Boschero, and she is named as such in the All You Need is Love edition) during the Prague shoot. "I'm supposed to meet Beatrice in her hotel lobby because there's a police agent posted at the elevator and another at the stairs;everyone has to show a room key. Beatrice sort of prostitutes herself in front of the stairway sentry: Cunningly dressed, she struts up and down the carpet runner from the reception desk to the dining room, as if she were streetwalking, and she sticks out her bodacious ass. Next she drops her Italian mini-purse . The stairway sentry dutifully bends over, turning crimson. At that instant, I race up the steps . . . .Beatrice is still lying on her belly. I've fucked her all night in that position, and she shrieked so loud, at the top of her lungs, by the open window that the police patrol in the street sent the night clerk up to her room."-he wrote.
According to his autobiography, Klaus Kinski had a brief sexual affair with Olga Schoberová during filming: "Olga is seventeen and has curly gold hair. She is the Czech baby star. The government took her passport away because she secretly allowed herself to be photographed nude for Playboy. I have to smuggle her into my hotel. Not that the Communist busybodies have anything against fucking, but they have something against individuals who fuck in hotels they're not checked into."- Kinski wrote.