In one scene, Tom Milford explains to Harvey Granson that the party scheduled for that night will celebrate the unveiling of the Statue of Liberty which took place seventy-eight years ago that day. So the date of the party is 28 October 1964 since the unveiling of the Statue took place on 28 October 1886.
This film is one of many Universal-International vehicles in the 1960s patterned from the blueprint that had served Rock Hudson, Doris Day and Tony Randall so well. The chief elements concern subterfuge of some kind between a womanizing bachelor and a woman who prioritizes her career before her love life. One of the parties poses as an alias and, at some point, the plot calls for the male to pass himself off as gay in order to lower her resistance to his seductive moves. The bachelor typically has a wealthy, neurotic sidekick, while the career woman turns to a cynical, outspoken best female friend. This film in particular is a direct descendant of Pillow Talk (1959), following every element of this template. Imitative efforts like this are the reason most fans assume that Hudson and Day teamed in countless pictures when in fact they made three, only two of which fit the mold.
Warren Beatty was first choice for the male lead. Once Beatty bowed out, Universal hit upon the idea of casting Sandra Dee's real-life husband, Bobby Darin, as the two had earlier teamed in Universal's If a Man Answers (1962). Darin enthusiastically came on board, accepted second billing to Dee and, in the bargain, penned the film's background score and title song, which he sings over the main title.
On their first date, Tom engages Joan in a round of questions to determine what kind of work she does. The wording of his questions is clearly a tip of the hat to the long-running television game show, What's My Line? (1950)