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- Bird-Being (single appearance)(no lines)(fantasy)
- Old lady (single appearance)
- Esther (single appearance)(no lines)
- Movie theater
- The Moon (cameo)
- Rocks (fantasy)
- A printing error switches the first pages of this and The Phantom of Youth.
- Fred, Daphne, and the Mystery Machine are absent.
- Shaggy indentifies his surname as "Rogers."
- The phrase "The Shadow knows" comes from "The Shadow," a pulp hero who used this catch phrase.