Jeepers It's the Creeper - S2-E3
Plot hole: There's no explanation or exposition whatsoever as to how the gang figured out that putting a flame on the paper would reveal the image of Mr. Carswell robbing the bank.
Scooby-Doo, Where Are You! (1969)
1 plot hole in season 2
Starring: Frank Welker, Don Messick, Casey Kasem, Nicole Jaffe
Revealing mistake: After Mr. Maxwell says that the local people refuse to work on the movie, Velma asks why. In her close up, her right pupil is horribly misshapen. Not round, but a wobbly, almost cloud like shape. (00:01:35)
Shaggy: Scooby-Snacks won't work on me this time.
Daphne: Would you do it for a Shaggy-Snack? A little something I whipped up.
Shaggy: Huh? A Shaggy-Snack?
Daphne: Yes, it's a pot-pie, with pizza crust, anchovies, pepperoni, cherries, all in a thick chocolate sauce.
Shaggy: Hahahaha! I'll do it! I'll do it!
Trivia: During the chase scene, there is an advert on the wall which says "H&B Tuna Co." - a reference to Hanna-Barbera.
Scooby's Night With a Frozen Fright - S2-E4
Question: Is Daphne holding her breath when the gang is in the tank underwater?