Continuity mistake: In the episode of Scooby movies where they meet the Three Stooges, Fred says that Velma is missing and they need to find her. When they go off to look for her they pass a window. Fred first, Daphne, then Velma (despite her being the one missing!), Shaggy, then Scooby.
The Scooby Doo Show (1976)
1 continuity mistake in show generally - chronological order
Starring: Frank Welker, Don Messick, Casey Kasem, John Stephenson
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.
More trivia for The Scooby Doo Show