Original screenplay was written by Betsy Drake, Cary Grant's wife. Grant originally wanted it to star her but his extra-marital affair with Sophia Loren complicated the project. The script was drastically re-written by two other writers to accommodate Loren and bears little resemblance to Drake's concept.
Cary Grant initially accepted his role because he was dating Sophia Loren, with whom he was madly in love. After she married Carlo Ponti, a heartbroken Grant wanted to back out. He couldn't, but the director made sure the production was a smooth one.
All three child actors "reunited", in a manner of speaking, in Paul Peterson's "A Minor Consideration," a business helping exploited former child actors cope and find support, both financially and emotionally.
In the French-dubbed version of the film, a mischievous translator replaced Sophia Loren's character name, "Cinzia", with "Gina". At the time Loren and Gina Lollobrigida were rivals for the "crown" of Italian sex symbols in film.
According to a report published in the Guardian newspaper in 2014, Cary Grant was in love with Sophia during their previous collaboration, The Pride and the Passion, and she had subsequently married Carlo Ponti instead. But the passion survived and director Shavelson had a tough time making this movie.