- Although tombstone crosses are usually edited out, like in "Call of the Haunted", for some reason those featured in this card were not.
- "Toon World" appears in the artwork of the following cards:
- In the first Japanese edition of this card and a few video games, such as Yu-Gi-Oh! The Eternal Duelist Soul, you must pay 500 Life Points during each of your Standby Phase to keep "Toon World" in play. Also if "Toon World" is sent from the field to the Graveyard, you gain all Life Points paid for "Toon World". This was most likely edited in newer versions due to complicating calculations.
- In the game Yu-Gi-Oh! The Duelists of the Roses, this card's two artworks were featured on two different cards:
- "Toon World" has an anime-only counterpart, "Toon Kingdom".
- "Toon World's" appearance involving a castle popping out of a book might have been inspired from a children's pop-up book. This was also suggested in the anime.
- In the anime, there is only one copy of this card, the one Pegasus uses. According to the anime, it was deemed too powerful to release for the general public.
- According to Pegasus, the page the "Toon World" book is open to is called "Evil Castle", and is the lair of "Toon Summoned Skull".
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