Just before filming began, Laraine Day replaced Maureen O'Sullivan, who had been announced as the film's female lead in November of 1939.
When someone suggests Ridley and Helen join the others after dinner for a game called "Indications", that was another name for Charades in that era.
And One Was Beautiful (1940) was based on the story of the same name by Alice Duer Miller. When the book was published in February 1938, The New York Times calling it "an exciting story of manslaughter."
The car Ridley drives Kate home from the party in is a 1937 MG SA Tourer with coachwork by Charlesworth. Only about 20 of these vehicles were made. In excellent condition in 2023, an example could be worth $150,000 or more.
Kate's car that she likes to work on it a 1930 Ford Model A.