When Laird Cregar asks who Gene Tierney, then serving in a shop, is, Spring Byington tartly remarks, "A shop-girl, of course. Who did you think she was--Brenda Frazier?" The very glamorous and wealthy Brenda Frazier was the most famous debutante of the 1930s.
Filming in Catalina was interrupted and cast had to return temporarily to the mainland due to the bombing of Pearl Harbor.
Hairy-chested Henry Fonda was forced to subject to a torso waxing for his bare chested scenes at the beach.
Studio publicity material noted that the yacht used in the film, the "Bali", was owned by John Carradine.
"The biggest man in pictures, Laird Cregar, won't be seen in a bathing suit on the screen. Studio executives took one look at the 285 pound actor doing a swan dive into a swimming pool for a scene in 'Rings on Her Fingers' and cut the scene out of the picture. Looked like Dumbo's mama had learned to fly." - Erskine Johnson's Hollywood, The San Bernardino Daily Sun, San Bernardino, California, Sunday 4 January 1942, Volume 48, page 8.