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 opens the bedroom door and sends Oliver crashing to the metal bed frame, the newspaper which Stan is holding changes from his right hand to left hand between shots.