Continuity mistake: When the Gladiator Zombie is chasing the Mystery Gang in the golf cart, he flicks his whip at them. Scooby is seen on the left side of the back seat looking out and covers his eyes. The very next shot, Scooby is suddenly on the right side of the seat looking forward.
Continuity mistake: As Daphne is talking about the old statues in the window, an Italian wearing glasses comes up and talks back, who has normal eyes. Just before it cuts away, he stops moving and suddenly the irises of his eyes are hollow, where the drawing was unfinished.