Larry Levenson is listed in the film's credits as Larry Levinson The King of Swing, "The King of Swing" being his real-life nickname. Levenson is playing himself, the actual owner of Plato's Retreat in New York City.
Actress Karen Harlow is actor Joe Limpett's real-life wife according to an early video reverse box cover.
Later releases of The Starmaker are missing footage of Kenny Dino's recording studio (he sings too), Copper Penny's amyl nitrate "popper" use and Larry Levenson's cast introductions on the dance floor at Plato's. Performers Tish Ambrose and David Ambrose only appear in the missing recording studio scenes. Marc Stevens, Veronica Hart and Joyce Dino only appear in the missing dance floor footage.