Starring: Don Messick, Casey Kasem, Lennie Weinrib, Heather North
Twenty Thousand Screams Under the Sea - S1-E9
Plot hole: During the diving contest Tiger Morris, who's posing as the sea monster, fakes his cries of terror and flees off to the left of the ocean. Then, seconds later he's suddenly back as the sea monster. Impossible for him to get into disguise that quickly.
Other mistake: When Scooby is eating the hot dogs at the "Hotus Dogus" stand, his tail goes transparent.
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