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.
Hang in There, Scooby-Doo - S2-E3
Continuity mistake: The pile of bootleg records suddenly gets bigger after Velma's shown holding some of them.