The Dan Cushman novel on which this film was based had previously served as the basis for the 1958 Broadway musical "Whoop-Up," which starred Ralph Young in the Presley role.
During the fight scene at the party, Elvis Presley goes outside to tell the band to play something slow. He and his friend Charlie Hodge, who has a bit role in the film as a guitar player in the band, start cracking up during Elvis' line. Charlie later said the reason for the laughter was that it was cold outside and Elvis' nose was running.
65th highest grossing film in the US of 1968.
The dilapidated, open-topped jalopy driven wrecklessly by Katy Jurado in this film had previously been driven by Judy Garland in the 1943 M-G-M musical Girl Crazy. It was part of the studio's permanent vehicle collection, and was hauled out of storage for its appearance here.