
The scenes at the Monterey house were shot at the studio's Golden Oak Ranch in Placerita Canyon, where Mitch's ranch was built. The Monterey scenes were filmed in various California locations, including millionaire Stuyvesant Fish's 5,200 acres (21 km 2) ranch in Carmel and Monterey's Pebble Beach golf course.
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The summer camp scenes were filmed at Bluff Lake Camp (then owned by the Pasadena YMCA, now by Habonim Dror's Camp Gilboa) and the family camping scenes later in the movie at Cedar Lake Camp, both in the San Bernardino Mountains near the city of Big Bear Lake in Southern California. The film was shot mostly at various locales in California. Production started in July under the title of We Belong Together and went until September. O'Hara said her contract gave her top billing but that Disney decided to give that to Mills she says this caused tension with the studio and was why she never worked with Disney again. She wrote in her memoirs that Disney offered her a third of her normal fee of $75,000 but that she held out for her quote and got it. It was also known as Petticoats and Blue Jeans and was the first in a five-film contract Mills signed with Disney, to make one each summer. Swift and Mills had just made Pollyanna for Disney. In March 1960 Disney announced that Hayley Mills would star in His and Hers to be written and directed by David Swift. The novel was discovered by Disney's story editor Bill Dover who recommended the studio buy it.
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The twins take every opportunity to exploit Vicky's hatred of camping, pulling a series of pranks on her. Maggie cajoles Vicky into taking her place, so she can become better acquainted with the twins. Mitch and Maggie reluctantly agree, and Vicky, who loathes the outdoors, is furious. They will reveal their identities only after a family camping trip.

To delay the return to Boston, the twins dress alike so their parents are unable to tell them apart. They make up before Maggie and Sharon are to leave the next morning, and Maggie wishes Mitch well with Vicky. The ex-spouses are at first drawn together, but then argue over why they divorced.

The girls scheme to reunite their parents by recreating Maggie and Mitch's first date. Vicky is jealous of Maggie staying at the ranch. Mitch is upset by Maggie's unexpected arrival, until he learns the truth and is reunited with both daughters. Susan tells Sharon to break up the couple, but failing that, Susan decides to end the charade, and after a happy reunion, Maggie returns her to California. Sharon learns that Mitch is engaged to a beautiful and much younger woman, gold digger Vicky Robinson, who intends to send Susan to boarding school after the wedding. In Boston with her mother and grandparents, Susan poses as Sharon, while Sharon goes to Mitch's California ranch as Susan.

Eager to meet the parents they were separated from, they decide to switch places, cut their hair identically, and coach each other on their lives. They overcome their mutual dislike when they discover they are identical twin sisters whom their parents Mitch Evers and Maggie McKendrick separated upon divorcing shortly after their birth. As punishment, they must spend the remainder of the camp season rooming and dining together in isolation. Their identical appearance causes jealousy, resentment, and a rivalry in which they continually get each other in trouble and disrupt camp activities. Teenagers Sharon McKendrick and Susan Evers meet at Miss Inch's Summer Camp for Girls.
