The production was overseen by a Catholic priest who served as an advisor during the shooting. While the final farewell sequence was being filmed, Bing Crosby and Ingrid Bergman decided to play a prank on him. They asked director Leo McCarey to allow one more take, and, as "Father O'Malley" and "Sister Benedict" said their last goodbyes, they embraced in a passionate kiss, while the off-screen priest/advisor jumped up roaring in protest.
The most profitable film in the history of RKO Radio Pictures.
Leo McCarey was inspired to write the original story in tribute to his own aunt and childhood counselor Sister Mary Benedict, one of the Sisters who helped to build the Immaculate Heart Convent in Hollywood and who died in a typhoid fever epidemic.
The first sequel to be nominated for an Academy Award for Best Picture.
The top-grossing US film of 1945.