Continuity mistake: Fred and Daphne use a branch to cut the zombies in half, but one shot later the same zombies are whole again even though their legs kept walking forward.
Continuity mistake: When the gang arrives at Moonscar Island, the sign near the dock is very tall. Later, when Shaggy tells Scooby to hurry up as he is picking peppers, the sign is much shorter than before.
Continuity mistake: In the scene where the boss finds Shaggy and Scooby in the storage room having eaten all the food, the banana peels and other scraps of food on the ground change between shots.
Continuity mistake: When Velma states that Semone must have found Moonscar's treasure, the shadow of the moondial becomes shorter between shots.
Continuity mistake: Between shots of Shaggy saying "It's gumbo, isn't it?" and Lena replying "You do know your food" the cupboard on the wall moves further away from the window.
Continuity mistake: When Daphne is talking with Chris on TV, the angle of the microphone on the table changes between shots.
Continuity mistake: As the gang approaches the door inside the secret passageway, their is a handle on it. When they come closer, the handle is gone.
Continuity mistake: When Dalphne says "It's too much like the good old days" between shots her hands go from being on her cheeks to on her hair.