Vampire Bats and Scaredy Cats - S2-E2
Continuity mistake: When Lisa's uncle shows her her grand-father's picture, it changes from one shot to another.
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.
The Creepy Heap from the Deep - S2-E8
Continuity mistake: Captain Clement's hair and beard briefly go back to his natural grey when he's still in his zombie makeup during the submarine chase.
The Chiller Diller Movie Theater - S2-E4
Continuity mistake: Scooby Dum's collar goes from its usual red to yellow briefly in one shot on the train.