Trivia

According to director Jack Hill, it wasn't until they were actually shooting that he learned that Sid Haig, who plays Hawk, the racing champion, didn't know how to drive a car.

Although the Pacific Northwest psychedelic band "The Daily Flash" is credited with the rock music heard on the film's soundtrack, the band had already broken up before the film's production. The soundtrack should be credited to the post-"Daily Flash" project known as "Two Guitars, Piano, Drum and Darryl".

Final film of Brian Donlevy.

The magazine Rick Bowman (Dick Davalos) is reading in the hotel room is the January 1967 issue of Hot Rod. On the cover is a picture Dan Gurney and his Gurney Weslake engine.

Although George Washburn, who plays race champ Ed McCleod, has been in a number of roles, mostly television, they are all uncredited parts except for two that have to do with cars: this movie, and as a Chauffeur in My Mother The Car.