In the novel on which the film was based, the character of Louise Elliott ends up marrying a different man in the denouement.
Originally the film credits were to read "Errol Flynn in The Sisters", but Bette Davis demanded equal billing alongside Errol Flynn. She also pointed out that the original credits had an unwelcome sexual connotation.
Several people are in studio records/casting call lists as cast members, but they did not appear or were not identifiable in the movie. These were (with their character names, if any): Edwin Brian (Newsboy), Rosella Towne, Susan Hayward, Paulette Evans and Frances Morris (Telephone Operators), John Harron, Lew Harvey, Richard Bond and Mira McKinney. The 4 telephone operators were possibly among a group seen only from the rear and are not recognizable.
Stock footage from Old San Francisco was used.