A sequence involving two Russian agents meeting covertly in a bar is underscored by Jack Shaindlin's song "I'm Tickled Pink" - the lyrics of which appear to add a comic overtone to the Communist-busting theme of the film. The exact same recording of the song is used in the popular video game "Fallout 3".
Final feature film of Virginia Gilmore.
Motion Picture Comics did a comic book adaptation of the film that sold for 10 cents each at the time.
The original captions on the existing behind-the-scenes photos from the film all mention the fact that it was made with the co-operation of the FBI.
Director, actor, and writer George Roy Hill plays a role in the film.