The song "Innamorata", written for this film, went on to be a major record hit for Dean Martin and several other singers.
According to the Paramount Collection at the AMPAS Library, this movie was produced at the cost of 1,701,083 dollars, which was 103,083 dollars over its allotted budget. Because of the budget overruns, a planned "The Bat Lady" musical production number was never filmed.
According to TMC, Jerry Lewis saw Shirley MacLaine on stage in "The Pajama Game", where she was understudy for Carol Haney, and convinced the producer to use her in this film, thereby launching her career.
Rick Todd's (Dean Martin's) hometown was mentioned as Steubendale. Martin's real-life birthplace was Steubenville, Ohio.
The spaceship model seen in the foreign experimental laboratory was a leftover miniature from Paramount Pictures' La conquista dello spazio (1955).