At Mary Astor's suggestion, her hair was cut into the chignon shape she wears in the film because rolling and styling it took too long. She then wore it the same but a bit longer in The Maltese Falcon (1941), causing a fashion craze.
When Pete returns from seeing his lawyer, early in the film, he finds Sandra's agent in the living room listening to her latest recording. This is an excerpt from the first movement of the Piano Concerto No 4 in D minor by Anton Rubinstein, a great rarity and certainly not recorded by anyone else in 1941. It was possibly chosen by Max Steiner because it was no longer in copyright, but whatever the reason, it was a most unusual and sophisticated choice.
Mary Astor mimed playing the piano in this film extremely convincingly, being an accomplished pianist in her own right. However, the actual piano playing on the soundtrack was dubbed by Max Rabinowitz. When close-up shots were required, Norma Drury 's hands are those we see on the piano.
Prior to it's nationwide release on April 12, 1941, the film premiered in Littleton, NH, on Bette Davis' 33rd birthday, April 5, 1941. This was a huge event for the town with music and fanfare. Bette's mother, Ruth, attended.
Peter's airplane is a Stinson Model 10 "Voyager", s/n7518, registration NC26243. Over 1,000 of all variants were built starting in 1939. This particular airplane was also used in the film Emergency Landing (1941). Last registered in 2014, this plane's private owner in California has allowed it to expire in 2017.