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* In [[7.20 The Girl with the Dungeons and Dragons Tattoo]], the contents of the suitcase Sam and Dean stole from the [[leviathans]] was a hunk of red clay, but in [[7.21 Reading Is Fundamental]] it appears as a gray stone before Dean breaks it open and recovers the leviathan tablet.
* In a deleted scene for [[13.07 War of the Worlds]] its shown that the reason [[Michael (Apocalypse World)|Michael]] never repeated the spell from the angel tablet is because Kevin didn't have enough ingredients to repeat the spell and they were almost impossible to find in the first place.
* The tablets have played a role in season 7, 8, 9, 10, 11 and 13, albeit with the roles in seasons 10 and 11 being minor cameos. The tablets
roles in the storylines of seasons 8, 9 and 13 were especially prominent.