One of the first films to be shot in the Los Angeles River.
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.
The half-fare airline ticket that cost $70.64 in 1951 would cost over $822 in 2023.
Several times it is mentioned that McGraw is driving a Plymouth sedan. This was fairly unusual in an era when specific automobile makes were seldom named.
Joe's car is a 1950 Plymouth De Luxe 4-door sedan.