The #12 given to Joe Namath ("CC") for the Moto X Race is the same number he wore on his jersey with the NY Jets.
Inside joke: Name of Sue Mengers, future 1970s super talent agent, appears as a supporting act on a motel nightclub's marquee, right below "Wayne Cochran and the C.C. Ryders". In real life, Mengers was Ann-Margret's agent.
Writer Roger Smith and actress Ann-Margret were husband and wife. (8 May 1967 - 4 June 2017) (his death).
The biker gang name "Heads" is a reference to drug use, such as "drug-head", "hop-head". It was a common term in the late sixties / early seventies. In many high schools it was commonly used as a reference to the long-haired clique (as in "straights", "socials", "jocks" and "heads".)
According to a contemporary Tuscon newspaper article this is the first film in which Ann-Margret did a nude scene.