Trivia

Konstantin Shayne (Professor Bruloff) and Tamara Shayne (Helena Nagard) play husband and wife; in reality are siblings.

In 1946, Angela Lansbury appeared in The Harvey Girls (1946), which features the song "The Atchison, Topeka and the Santa Fe." In this movie, she appears in a scene in a bar where the band can be heard playing the song's music.

Of the six actors whose name appears before the title card - in order Walter Pidgeon, Ethel Barrymore, Peter Lawford, Angela Lansbury, Janet Leigh, and Louis Calhern - only Lawford has never been nominated for an Oscar, while Barrymore is the only one to have won.

After World War II, Operation Keelhaul was a forced repatriation of Soviet citizens and Soviet army members in the West back to the Soviet Union. While forced repatriation focused on Soviet Armed Forces POWs of Germany and Russian Liberation Army members, it included many other people under Allied control.

Refoulement, the forced repatriation of people in danger of persecution, is a human rights violation and breach of international law. Thus, Operation Keelhaul has been called a war crime, especially in regards to the many civilians forced into Soviet work camps, many of whom had never been Soviet citizens, having fled Russia before the end of the Russian Civil War. Suicide was a common response for many so targeted. Operation Keelhaul is mentioned in this documentary series Gulag: The History (2019) on Soviet prison camps: Apogée et agonie : 1945-1957 (2020).

Audrey Totter was initially set to play Audrey Quail.