Scooby's Night With a Frozen Fright - S2-E4
Continuity mistake: Prof Ingestrom's parka is found, then it becomes Prof Wayne's parka.
Scooby's Night With a Frozen Fright - S2-E4
Continuity mistake: A heater on a table disappears then reappears as the gang investigates the room.
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.