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
Continuity mistake: Scooby finds a clump of ape hair stuck in the wine cask. It cuts to the gang, then back to the cask as they walk up and suddenly the clump of hair is twice as thick. (00:16:45)
Don't Fool With a Phantom - S2-E8
Shaggy: Hey, Scoob, aren't our wax statues the greatest?
Scooby: Yeah.
Daphne: Just what are you fellas going to do with those wax dummies you made?
Shaggy: Well like simple, next time we have a mystery, those dummies can go instead of us.
Fred: There's only one problem. How to tell one pair of dummies from the other.
Shaggy: Very funny, very funny.
Scooby: Yeah. Rery funny.
Question: We never found out what the ham and chicken bones had to do with anything. They were ham and chicken until Scooby ate them. Afterwards, Shaggy wonders why the ghost would keep ham and chicken in the fridge. This was never answered in the episode. Why were they important?
Answer: Shaggy told the gang he found ham and chicken in the fridge. He said, "Why would a ghost need food?"
Chosen answer: A ghost wouldn't have to keep any food in the fridge - they don't need to eat. So it is one thing that proves the ghost is not a ghost.