Continuity mistake: At the party, Garma is holding a normal glass when he talks to the two sycophants with horrible fashion taste, but when he looks towards Char approaching the bar, his glass suddenly acquires a dimpled surface. (00:03:00)
Continuity mistake: When Shaggy, Scooby and Scrappy have finished perming the lion's hair at the Coliseum, Scooby grabs Scrappy and sends the lion for a spin in his chair. In the next shot, the emperor says "Get off with the lion!" and he pulls a leaver releasing the trap door. But when we see saw the lion falling through the trap door, the barber's chair is nowhere to be seen.