The "evil" black car in the film was a customized 1971 Lincoln Continental Mark III designed by famed Hollywood car customizer George Barris. There were four cars built for the film in six weeks. Three were used for stunt work – the fourth was for closeups, etc. The stunt cars were destroyed during production – the fourth is now in a private collection.
The late Church of Satan leader Anton LaVey was given a "Technical Advisor" credit on the film. His quote: "Oh great brothers of the night who rideth upon the hot winds of hell, who dwelleth in the Devil's lair; move and appear," is given in the opening credits and is taken from the "Invocation of Destruction" in The Satanic Bible.
The film's main theme, heard predominantly throughout, is a reworked, orchestral version of Berlioz-Symphonie Fantastique, also used in "The Screaming Skull" (1958).
Footage from this film is seen in the Knight Rider episode "Trust Doesn't Rust", shown at the end when "KARR" is destroyed by driving off a cliff, a glimpse of "The Car" is seen going over the cliff instead