One scene was cut from the film by the producer at the urging of a distributor, much to the disgust of director Curtis Harrington. This scene features Terry wandering around the zoo looking at the caged apes. He hears a familiar laughter and turns to find Tina and her boyfriend making out in another nearby cage. This sequence preceded the scene in which Terry arrives home and encounters Mrs. Orland descending the staircase. Harrington described the footage as "wonderful" and the sequence as "very important psychologically" but he concluded the film was otherwise cut together and released as he intended.
According to director Curtis Harrington, 'The Killing Kind' barely saw a release. The problematic distributors cut a deal where the film would only be screened in a few cities in the United States. Other distributors showed an interest in the film but, since no records were kept of where the movie had already been screened, it never secured further theatrical distribution.
The Spanish maid who in real life occupied the room that doubled for Lori's in the film was continuously being displaced, and she became so overwhelmed when she heard screaming coming from the bathroom that she packed her bags and returned to her native country.
Cindy Williams had a lengthy commute. While filming 'The Killing Kind', shot in the Larchmont area of Los Angeles, Williams was also working on The Conversation (1974), which was shot in San Francisco.
The trivia items below may give away important plot points.
For the scene in which the cat was strangled and was required to hang limp, a vet was called to set who simply administered a sedative. However, the cat which is later seen in the garbage can was really a feline that had been euthanized by the SPCA.