'John Lund' and Alan Ladd were both sought for the role of Lt. William Calhoun, before it being given to William Holden.
"Lux Radio Theater" broadcast a 60 minute radio adaptation of the movie onApril 7, 1952 with William Holden reprising his film role.
Robert Cornthwaite's film debut.
The chase scene on the elevated train used the Third Ave El in New York City for long shots and the Pacific Electric Railway cars in L.A. for close in shots on the train.
The movie shows Union Station in its heyday. Due to closures and a subway that was built, many of the scenes in "Union Station" (ie the scenes involving the ransom payments) cannot be shot again in the same way.
There were 2 former mayors of Mayberry in this movie: Parley Baer (Mayberry mayor Stoner) was a cop and Dick Elliott (Mayberry mayor Pike) was a powerhouse workman.