Several key cast members are uncredited, and their identities remain unknown, most notably "Goof" the cat-hoarding neighbor, the detective, the skinny morgue attendant, Maria Altura (who Dr. Meirschultz brings back to life), and Altura's body double (for scenes requiring nudity).
A few of the intertitles comment on the action in the film, as they were used in silent films. Five of them describe various mental illnesses: Dementia Praecox (now called Schizophrenia), Paresis (Neurosyphilis), Paranoiac (Paranoia), Manic-depressive Psychoses (Bipolar Disorder), and Manias.
Because Don Maxwell doesn't know what to put in the syringe he puts in water saying that it would not be harmful, injecting water into a vein however would cause red blood cells to rupture which could, depending on the type and amount of water, be very harmful.
Author and historian Bret Wood has argued that the backyard cat farm was a real, illegal operation in a suburban Los Angeles backyard. Wood has also posited that the morgue was found or rented set, possibly even a local haunted house sideshow attraction, and not a set built by Dwain Esper and his crew.
Marian Constance Blackton is sometimes reported, incorrectly, as appearing in male drag as the neighbor who catches and breeds cats. She plays a female neighbor who is questioned by the detective.
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