Ingrid Bergman agreed to do the film with the script sight unseen in order to work with her friend Cary Grant again.
The casting of Cary Grant and Ingrid Bergman as slightly older and wiser lovers had greater relevance to 1958 audiences. Grant was on the third of his five marriages, while Bergman had ridden the waves of scandal following her adulterous relationship with Italian director Roberto Rossellini.
It was a number of firsts for Ingrid Bergman: the first time in an out-and-out comedy, the first time that she played a woman of fashion, wearing the last of the personal creations by the late Christian Dior and the Rolls Royce that was supposed to be hers was the first 1958 Silver Wraith to be seen on the streets of London. It was also the first time that The Garrick Club was used as a location.