- This card was formally known as "Hidden Book of Spell" in the TCG until its reprint in Gold Series: Haunted Mine.
- This is because this card and "Spellbook Organization" are a valid member of the Spellbook archetype released in Return of the Duelist, despite being released many years before the archetype was created.
- This is because their Japanese names use the same characters for spellbook, 魔導書 madousho, as the Spellbook archetype. It was simply translated as "Book(s) of Spell" before the archetype was created.
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