Items in the NYT incorrectly identified the film as singer Bobby Darin's cinematic debut as Darin had previously appeared in Pepe (1960). On set, he met and fell in love with co-star Sandra Dee, and the two quickly married in early Dec 1960. Their experience on Tuya en septiembre (1961) was depicted in the Bobby Darin biography Beyond the Sea (2004).
When Raoul Walsh sold Rock Hudson's contract to Universal, he retained the rights to the actor for one picture. This obligation was settled a decade later when the director was given a percentage of the profits from Tuya en septiembre (1961).
Tuya en septiembre (1961) was filmed mostly on location, and due to weather conditions it took almost 12 months to shoot. Location filming took place in the coastal town of Portofino, Italy, where cloudy weather caused production delays. Soundstage work was scheduled to follow at Cinecitta Studios in Rome.
Tuya en septiembre (1961) also became a footnote in movie and aviation history. By 1961, airlines had begun showing films on flights, and Tuya en septiembre (1961) was the first movie to be shown on transcontinental and intercontinental flights (See also Poseídos por el amor (1961)). Co-star Walter Slezak delivered the film to TWA for its premiere in-flight screening. It was a perfect appetizer for travelers on their way to an Italian holiday.
The name that the butler gives to the villa when he turns it into a hotel ("La dolce vista") is a play on words of Federico Fellini's film La dulce vida (1960). The surname of the character played by Gina Lollobrigida is Fellini.