Tim Matheson and Jennifer Leak (who played the eldest children) married the year the film was released.
Lucille Ball co-produced the film under her company, Desilu Productions. When the film became a surprise smash hit grossing over $17 million on a $2.5 million investment, she became furious about it. She hadn't anticipated the film's huge box-office success and failed to provide a tax shelter for her personal profits, resulting in most of her share going in taxes.
Henry Fonda and Van Johnson had both co-starred with Lucille Ball once before: Fonda in The Big Street and Johnson in Easy to Wed.
Helen Eileen Beardsley (who wrote the book Who Gets the Drumsticks? on which this was based) died 26 April 2000, aged 70, Healdsburg, California, USA (Parkinson's disease).
Based upon the real story of Helen Eileen Beardsley and her husband.
During a Barbara Walters interview, Jane Fonda claimed that her father was deeply in love with Lucille Ball and that the two were "very close" during the filming of Yours, Mine and Ours.
Loosely based on the book 'Who Gets the Drumstick?' Similar to The Sound of Music, there were a lot of changes made for the movie whereas in the actual book and real life, the children had a better liking to each other right away. Also, Frank and Helen actually had two children together.
The baby born at the end of the movie is Joseph John Beardsley. He was born in the early hours of 14 July 1962.
The commercial success of Yours, Mine and Ours led ABC and Paramount Studios to green-light The Brady Bunch.
The Doctor, Tom Bosley, and Tracy Nelson, who was only an infant in this movie, would eventually team up 21 years later to co-star in Father Dowling Mysteries.
The real Helen Eileen Beardsley appeared on To Tell the Truth where she related her story to the panel.
The real Helen and Frank Beardsley had two children following their marriage: Joe and Helen.
The wedding invitation used in the movie is the actual wedding invitation designed by Frank Beardsley, husband of the real Helen Eileen Beardsley. The children's names are listed in their real-life birth order.
The wedding scene was filmed in the old Mission Dolores church in San Francisco, California, directly next door to the large, modern church built after the 1906 earthquake. Services are seldom held in the old church, which is more of a tourist attraction.
When the television show, The Brady Bunch was in the beginning phases of production, the makers of "Yours, Mine and Ours" threatened to sue claiming that the concept was too similar to their own. The threat was withdrawn, however, when Brady Bunch producer Sherwood Schwartz countered the action with documentation that his original script was shown to have a copyright date before that of the movie. The final evidence that halted any legal proceedings was the fact that the original Brady Bunch title, according to the original draft of Schwartz's script, was "Yours and Mine."