Continuity mistake: When Pluto takes Persephone away to the Underworld, her flower chaplet remains lying on the ground up above, and the elves find it. However, when they arrive in the Underworld and Pluto carries Persephone to the throne, her flower chaplet is still adorning her head, but then it vanishes before he crowns her a queen. (00:03:20)
Continuity mistake: When Stan and Oliver set the trunk on fire, the trunk flies up into the air and lands upside down. In the next shot, the trunk is now the right-side up.