One of the first films to be shot in the Los Angeles River.
The half-fare airline ticket that cost $70.64 in 1951 would cost over $822 in 2023.
Completed after The Narrow Margin (1952), one of Charles McGraw's other notable film noir starring roles, but released before that film because RKO Pictures owner Howard Hughes toyed with the idea of reshooting all of McGraw's scenes with Robert Mitchum in that film in order to boost it's profile. That film was ultimately released as originally shot the year after this one.
Joe's car is a 1950 Plymouth De Luxe 4-door sedan.
Some of Paul Sawtell's score was simply recycled from Dick Tracy vs. Cueball (1946) and subsequent films in the Dick Tracy series that RKO released in the late 1940s.