[1][2][3] The 1960s novelty singer known as Mrs. Miller performs in a cameo role, and the film features performances by the bands the Leaves and the Bantams as well as a brief appearance by Glen Campbell, playing a fictional singer.

Tony Krum, a music promoter, suggests Hallie and Cliff sing together, and the duo become popular recording artists.

[4] In an uncredited appearance: one of the dancers is Teri Garr, specifically as one of the Whiz-Bam girls.

From the blog Comet Over Hollywood:The Cool Ones has earned a place on my list of the worst movies that I have ever seen.

[6] And from the New York Times:The Cool Ones [is] a rock 'n' roll comedy, so-called, about a pop singer (Debbie Watson) who is on the rise and a big-name crooner (Gil Peterson) who is on the skids.