Continuity mistake: The boss enter the storage room carrying the clipboard in his left hand. In the next shot, when Shaggy says "Like, hi boss" it's in his right hand.
Continuity mistake: Between shots of Scooby sniffing the cat food, the things in the cupboard behind him change.
Continuity mistake: At the start of the opening scene, the moat monster is revealed to be Mr. Beeman, and when he shouts, "I would have gotten away with it if it wasn't for that big dog and you meddling kids," in this overhead shot, Scooby's paws are bare. In the next shot, the moat monster's mask is suddenly over one of his paws.
Continuity mistake: When Scooby is chasing the cats, he gets stuck in a log that has a hole in the top. This hole disappears a few seconds later.
Continuity mistake: When Mystery Inc. visits the fortune teller, the pedestal the crystal ball is on changes from grey to brown.
Continuity mistake: When the bat-like monster is chasing Shaggy and Scooby and trips over the pot, the amount of spilt flowers and dirt changes between shots.
Continuity mistake: When the pirates are overturning the table, the position of many of the items on the table changes between shots.
Continuity mistake: When Lena suggests that Fred is too scared to go to the island, the table with the bananas on it that was there a few seconds earlier has vanished.