Other mistake: When Scooby is eating the hot dogs at the "Hotus Dogus" stand, his tail goes transparent.
Scooby-Doo and Scrappy-Doo (1979)
1 other mistake in Et Tu, Scoob?
Starring: Don Messick, Casey Kasem, Lennie Weinrib, Heather North
Other mistake: When Scooby is eating the hot dogs at the "Hotus Dogus" stand, his tail goes transparent.