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The opening credits list the singers and singing groups who appear in the film. All cast, disc jockeys or "DJs" (who appear as themselves) and most of the crew credits are listed in the ending credits. Between the DJs and crew credits, an alphabetical list of songwriters appears without song titles. Although credits list Minneapolis disc jockey Sandy Singer's radio station as WTCN, in the film he verbally identifies himself, and is seated before a sign identifying the station, as WDGY. The singing voice of actress Freda Holloway was dubbed by popular singer Connie Francis.
Performances by popular singers and singing groups are interspersed throughout the film, with the singers portraying themselves performing variously in a telethon, a Music Operators of America convention or "Pete's" Palladium show. Frankie Avalon is described in the film as a new talent being considered by "Grace" and is shown in a recording session. Brief exterior, stock shots of New York and London appear in the film. A poster advertising Damn Yankees, a musical that ran on Broadway from May 1955 to October 1957, is shown in a New York street scene.
Throughout the film, the success and failures of Pete and "Honey" are shown in the fictional headlines of Variety, Billboard, The Cash Box and other real-life industry trade journals and through the announcements of various disc jockeys. Jamboree! marked the film debuts of television personality Dick Clark and most of the featured musical performers, among them, Avalon, Dick Clark, Jerry Lee Lewis and Slim Whitman. The Variety review stated that the film was "old-fashioned in concept, reminiscent of the early days of talking pictures when producers slapped a group of singing acts together." The Los Angeles Mirror review reported that the film was "like a throwback to the early days of Vitaphone musical reels." Jamboree! was one of the films featured in the 2000 television documentary Hollywood Rocks the Movies: The Early Years (1955-1970).