The movie that Ellen (Doris Day) describes to Bianca (Polly Bergen) while giving her a massage is My Favorite Wife (1940), of which this is a remake.
Doris Day wrote in her 1975 autobiography that because of her cracked ribs, she was so mummified with tape and bandages under her costumes it was difficult to breathe and painful to laugh.
In bonus feature on the DVD release, Polly Bergen admitted she had misgivings about playing "second banana" to Doris Day. Day was the most popular actress in the world at the time and Bergen expected her to behave like a diva. However, Bergen admitted to "falling in love" with Day, finding her to be extremely charming, funny and generous.
The producers scheduled the scene with Doris Day riding through a car wash for the last day of shooting, because they were concerned the detergents used in the car wash might affect Ms Day's complexion. When the scene went off without a hitch, they admitted their ploy to Day, then used the story in promotional materials for the film.
A re-shot version of Something's Got to Give (1962), the never completed film Marilyn Monroe was working on when she died. With Dean Martin in the James Garner role.