* AdaptationDisplacement: Yeah, this is actually based on a book, ''Oms en série'', by Stefan Wul. Granted, it never got translated into English, until 2010 -- 58 years after it was published.
* CultClassic: Usually shelved in the "cult" section to boot. The fact that it was brought overseas by Creator/RogerCorman, the grand master of cult flicks, also helps.
* NightmareFuel: Ever see a film where people [[BloodBath bathe in the blood]] of a creature they killed and it's sorta erotic?
* WhatDoYouMeanItWasntMadeOnDrugs: It was made by Czech avant-garde artists (but it ''was'' made in 1973).