- Acting for Two: Tim Curry voices both the Goblin King and the unnamed werewolf Scooby and Shaggy run into when they first enter the spirit world, though he is uncredited for the latter.
- Casting Gag:
- Celebrity Voice Actor: Has a lot of well known actors including Wayne Knight (Krudsky), Tim Curry (the Goblin King), Hayden Panettiere (Fairy Princess Willow - and despite being first-billed among the "guest stars," Panettiere has very little dialogue), Wallace Shawn (Mr. Gibbles), Lauren Bacall (the Grand Witch), James Belushi and Larry Joe Campbell (the Goblin King's henchmen). And Jay Leno (Jack O'Lantern).
- In Memoriam: The end credits feature a dedication to Paulette Oates, who helped resurrect Warner Bros. Animation in the late 1980's.
- Working Title: Production sheets list the movie's title as Scooby-Doo and the Shadow Goblins.
Trivia / Scooby-Doo! and the Goblin King