Bottom of cover notes return of Herbie: "He's back again! Herbie Popnecker, the world's strangest boy, tackles the supernatural, in... 'Herbie and the Spirits!'"
Herbie looks and talks differently in this pre-Herbie series story. In this story, Herbie's pants are brown; in all other original stories, they were blue. The being called Frankenstein is really Frankenstein's Monster, but is called Frankenstein throughout the Herbie stories.
Letters from John Marry, Richard Ierardi, Joan Burton, Bill Hix, James Scully, and Alex Heppenheimer.