Originally playing stateside in an edited version titled Unsane, writer-director Dario Argento's Tenebrae (often Tenebre) was released two years after Brian De Palma's Dressed to Kill and two years before De Palma's Body Double, making one suspect these filmmakers were busy borrowing from each other's works with frequent regularity.
A murder in a public park provides the blueprint for a similar scene in Dario Argento’s Four Flies on Grey Velvet , and a pair of shoes poking out from behind a curtain, was also seen in The Forbidden Photos Of A Lady Above Suspicion (the same year) and later duplicated in Brian De Palma’s Dressed to Kill .