Capt. Robert H. Wise, who lost 90 pounds in a North Korean POW camp, served as the film's technical advisor and attested that all the torture scenes in the movie were based on actual incidents.
Film debut of Dick Sargent.
No female is seen or heard in this movie.
The button-down-the-side Chinese jacket that Dewey Martin wears in two scenes with Oskar Homolka was originally worn by Paul Muni in The Good Earth.
The New York opening occurred on May 8, 1954, at the Victoria Theater on Times Square.
While the Pentagon cooperated in the making of this movie, it subsequently declined to promote it. In 1954 the Pentagon was prosecuting some GIs for "collaborating" with the enemy during the Korean War, and it may have feared that the character Dewey Martin played in the film could cast doubt on these cases. Martin played a GI who seems to "go over" to the Communists but is eventually revealed to be an American secret agent only pretending to be a collaborator.