Marilyn Monroe was promised the lead role in The Seven Year Itch (1955) if she appeared in this film to boost the box-office potential. The role of Vicky was written especially for this purpose, and songs such as "Heatwave" originally intended for Molly were assigned to her.
Marilyn Monroe's voice on the Decca soundtrack album "There's No Business Like Show Business" was replaced by singer Dolores Gray because Monroe's voice was under contract to another record company that would not release the rights for use on the album.
Donald O'Connor had separated from his wife of ten years. She and Dan Dailey, who played O'Connor's father, were dating during the shooting of the film. After filming wrapped, the O'Connors divorced and shortly thereafter Gwen and Dailey married.
During the making of the CD, it was discovered that half the "Play a Simple Melody" duet was deteriorated beyond repair, with the result that Ethel Merman is credited on the CD label with singing with a "temporary vocal double for Dan Dailey". However, the non-stereo version was intact and was added to the CD as well - they are tracks Fourteen and Fifteen.
During the filming of the scene where Donald O'Connor and Marilyn Monroe were kissing, there were over 1,000 onlookers who had drifted over from other sets.
"Anything You Can Do" (music and lyrics by Irving Berlin), sung by Ethel Merman and Dan Dailey, was cut from this movie. The song as filmed still exists. In 1946, Miss Merman and Ray Middleton had introduced this song in the Broadway musical, "Annie Get Your Gun."