The movie's title is taken from the second line in the second verse of Lord Byron's "And Wilt Thou Weep When I am Low?" The verse is shown on-screen and voiced (by director William Conrad) in a prologue. Both incorrectly say "My blood runs cold...." instead of "coldly". The reason for this is to fit the title of the movie. "My Blood Runs Coldly" wouldn't sound as good for a movie title.
One of two B&W Neo Noir Thrillers directed by William Conrad (and featuring a plot involving someone's possible psychosis) in 1965.
The climactic chase scene was filmed at the Del Monte Sand Plant.
Russell Thorson (The Sheriff) would appear in three episodes of director William Conrad's series Cannon playing three different characters.
The radio Julie is dancing to is a Zenith Trans-Oceanic Royal 3000-1. It was an expensive, top-of-the-line shortwave, AM/FM radio at the time, MSRP was $275.00 which equates to over $2,300 in 2020.