The opening scene of the car being towed replicates the one in Billy Wilder's Ace in the Hole (1951). Writer-director Henry Kesler acknowledged the hat-tip by naming the place "Wilder's Garage."
Filmed before, but released after Ruth Roman's fateful trip aboard the luxury liner, Andrea Doria. The ship collided with another and sank on July 26, 1956. Miss Roman and her young son were among the survivors.
The motel owner {Harry Hines} was in another Ruth Roman film, Strangers on a Train (1951). He was the amusement park employee who crawled under the out-of-control merry go round and, quite catastrophically, stopped it. Hines performed the stunt without a stand-in or special effects.
The large convertible that Ann Nicholson (Ruth Roman) drives is a 1956 Lincoln Premier Convertible. The car that John Emmett (Sterling Hayden) is towed in the opening shot is a 1953 Chevrolet Bel Air Convertible. FBI Agent Jim Anderson (Ken Curtis) drives a stylish 1956 Ford Customline Victoria Hardtop. Dr. Simmons (Werner Klemperer) is in a 1955 Buick Special Sedan.