- California Doubling: Filmed on the Samuel Goldwyn Studios lot in West Hollywood. They actually tried to get permission to film in the Soviet Union, but Soviet officials pointed out that that would be just slightly impractical, what with World War II still going on at the time.
- Creator Backlash: Lillian Hellman, who wrote the screenplay, did not appreciate the final film, which she described as a "big-time, sentimental, badly directed, badly acted mess."
- What Could Have Been: The movie was originally conceived as a documentary about the war in Russia. When that fell through, it became a "semi-documentary" film that would still be about the war in Russia, but filmed in Hollywood. Lillian Hellman's script was written for this version. Once production began, Executive Meddling changed it into a typical wartime drama, much to the chagrin of Hellman.
Trivia / The North Star