The movie 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.

Doris Day proved what a trouper she truly was when James Garner accidentally cracked 2 of her ribs (during the massage scene, when he pulls her off Polly Bergen). Garner wasn't even aware that Day was injured until the next day, when he felt the bandage while putting his arms around her.

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 the 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.

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.

Something which was kept it of the news in the whole tragic situation which surrounded this film's original production, was that Ms Monroe was rehired shortly below her death. The studio was hæmorrhaging money due to the out-of-control budget/production of Cleopatra (1963) (in inflation-adjusted costs, it was over US$1BILLION), and the ONLY other production was'...Give'. Things were so dire, the studio was forced to sell much of its backlot - it becoming Studio City. After Ms Monroe died, the studio wanted to recoup any possible money from that production, and after rewriting, it became a vehicle for Ms Day, which incedentally was one of the biggest money-makers for '63.

When Ellen Arden (Doris Day) drives up to her home, the incidental music playing is 'Something's Got To Give,' which was the original version of the film's original title, when it starred Marilyn Monroe, Dean Martin and Cyd Charisse, and is played here as a small acknowledgment of this (the song - title and all is actually from the film, Daddy Long Legs (1955) - also a 20th Century Fox production).

The hotel used as the Monterey hotel, where Nick Arden goes with Bianca (and to which he'd first gone when he married Ellen) is actually the Beverly Hills Hotel. As such, it's not on the ocean's edge (Beverly Hills is several miles inland). The long-shot of the hotel with the ocean (and the incorrectly 'setting sun' - see 'goofs' about that) in the background are a matte shot.

This film became the sixth-biggest moneymaker of 1964.

This film is loosely based on Alfred Lord Tennyson's famous poem 'Enoch Arden' (which, through a bit of 'screenwriters' translation' became Ms Day's character name; Ellen Arden). In the poem, a husband is shipwrecked and presumed dead, only to return home to find his wife involved with a man he used to know. In this film the roles of husband and wife are reversed. The poem also served as the source material for My Favorite Wife (1940) (which Ms Day jokingly references as she massages Ms Bergen), the film of which this is a remake, as well as another box office hit of 1940, Too Many Husbands (1940).

The car Doris Day drives and goes through the car wash in is a 1963 Chrysler Imperial.

The Arden's house - which was originally built for Something's Got To Give - is a (very accurate) recreation of 'Something's' director's home; George Cukor. There were some slight changes between its use in 'Something,' and here in Move Over, Darling' most notably the pool's perimeter was painted, and also as Ellen (Doris Day) first walks to the pool area, the house (on the left side) has a (far back) door, and a 2nd door, and some shrubs. When it was in 'Something,' the shrubs were actually an open-sided space, with part of the house's upper-stories overhanging it.

Doris Day and Thelma Ritter had previously co-starred in Pillow Talk (1959).

When Bianca is helping Nicholas out of the car and into the house (Nicholas pretending to have hurt his back), the jacket Bianca is wearing is the same pattern/material as one of Marilyn Monroe's dresses from Something's Got to Give (1962) - specifically, Marilyn's dress when she first comes home and sees her children in the pool (on which this film's script is based).

The Arden home was located on Wyton Drive and South Mapleton in Holmby Hills in Los Angeles. Unfortunately, the house shown was later torn down to make room for a larger house.

The exterior front of the house where James Garner lives in this film is an actual Holmby Hills residence, and was later used as Joan Crawford's Beverly Hills mansion in the 1981 film Mommie Dearest.

As most people who see this film know, this film's a re-worked version of what would've been Marilyn Monroe's Something's Got to Give (1962), and there's many bits of trivia surrounding this production. Elliot Reid, who plays Dr. Schlick in this version, had co-started with Marilyn in Gentlemen Prefer Blondes (1953), as Ernie Malone, who's sent by Lorelei (Marilyn) Lee's boyfriend (Gus Edmond)'s father, to spy on her, so he can prevent his son from her.

The basic structure and plot of this film very closely resemble the 1940 screwball comedy My Favorite Wife, of which it is a remake. Much of the dialogue from that film is "recycled" here verbatim.

Released in December, 1963, the movie makes a timely reference to a major historical event. When Doris Day is shown being rescued by the US Navy, an officer says that it was "the greatest Navy rescue since Gordon Cooper." This refers to the navy pickup at sea of astronaut Gordon Cooper returning from the sixth and last Mercury manned space mission on May 17, 1963.