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.