[9] Since these songs had been recorded over a period of several years, the album had several producers, including Steve Sholes, Joseph Lilley, Chet Atkins, Urban Thielmann, George Stoll, Presley himself, and Felton Jarvis.

"Rock-A-Hula Baby" dated from the 1961 soundtrack to Blue Hawaii, pulled off that album as the flip to accompany "Can't Help Falling In Love" as a single.

[10] Three tracks were the advance singles for their respective soundtracks: "Bossa Nova Baby" for Fun in Acapulco; "Kissin' Cousins" for its album; and "Return to Sender", released a month before Girls!

[11] "Viva Las Vegas" (the flipside to "What'd I Say"), by the team of Doc Pomus and Mort Shuman, would prove a more durable Elvis recording, receiving myriad cover versions including those by the Dead Kennedys, Bruce Springsteen, and Nine Inch Nails.

The gospel song "Crying in the Chapel" had been recorded during the sessions for His Hand in Mine, this five-year-old track going to number three and selling a million copies as a single in 1965.