This was Bill Bixby's last film role after a thirty-year acting career.
Was considered the official pilot of the "Diagnosis Murder" series that lasted until 2002
In the garage scene, just after the character played by Bill Bixby is hit by the killer's vehicle, the killer throws a belt and his face can be seen a little.
This movie, despite being the pilot of the "Diagnosis: Murder" series, is the second appearance of Dick Van Dyke as Dr. Mark Sloan; a year before, Dick Van Dyke debuted as Mark Sloan in an episode of "Jake and the Fatman".
Only in this movie, Cynthia Gibb played Dr. Amanda Bentley, and Victoria Rowell played the role for the rest of the films and the television series.