Due to military intelligence and secrecy reasons, Hollywood film studios were prevented by the U.S. government from mentioning the OSS (the Office of Strategic Services) in movies during World War II. However, this movie was first released in September 1946, which was after the end of World War II, hence explaining why the OSS was mentioned in this movie.
Anti-atomic bomb dialogue was removed before release.
Gary Cooper's role was based on the real-life exploits of Michael Burke, who would later become President of the New York Yankees on behalf of CBS. He also ran Ringling Brothers, Barnum & Bailey Circus.
Dan Seymour became friends with director Fritz Lang on the set of the movie after Lang discovered he spoke German. Seymour maintained a life-long friendship with Lang and became the executor of Lang's estate.