Revealing mistake: During the opening credits, after Merlin appears, we see Shaggy for about 1-2 seconds with no arms.
The Scooby Doo Show (1976)
1 revealing mistake in show generally
Starring: Frank Welker, Don Messick, Casey Kasem, John Stephenson
Hang in There, Scooby-Doo - S2-E3
Continuity mistake: In the cavern, Scooby and Shaggy dig holes in the ground. The rest of the group notice a truck driven by the Pterodactyl going toward them. Discs and cassettes fall from it. The shot later, the stones behind them have disappeared and the pile of discs have a different shape.
More trivia for The Scooby Doo Show