- The song "The Meanest Girl in Town" was one of the only songs not composed for this movie. It had been written for Bill Haley and the Comets and recorded by then in 1964 under the title "Yeah She's Evil".
- For reasons unknown, several of Elvis' songs are slightly sped up, making his voice sound higher than usual. This is most noticable on the title track. This error appears to have originated in the recording studio, as the RCA soundtrack album retains the sped up versions of the songs. A recording of "Girl Happy", mastered at the proper speed, would not be released until the 1990s.
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