Don't Fool With a Phantom - S2-E8
Continuity mistake: When Fred says "Are we glad to see you guys!" after grabbing hold of Shaggy and Scooby, you can see behind Velma there is a hole in the wall. But in the close-up of Velma in the next shot, the hole has gone.
Don't Fool With a Phantom - S2-E8
Continuity mistake: When Shaggy and Scooby Doo are on the floor after escaping from the Phantom on the conveyer belt, you can see there is some rope around them. But when the two run away from the Phantom, the rope has gone.
Don't Fool With a Phantom - S2-E8
Continuity mistake: When Shaggy and Scooby Doo arrive at the dinner table, you can see there is a jelly opposite the chicken. But when the Wax Monster comes to the table, the jelly has gone.
Don't Fool With a Phantom - S2-E8
Continuity mistake: At the museum, Fred discovers a sign saying "Wax Phantom Display" on a concrete block. But when we see a full view of the gang a few seconds later, the sign and the block have disappeared.
Don't Fool With a Phantom - S2-E8
Continuity mistake: Daphne is wearing pink tights at the start of the episode, but when the gang discover that the safe was robbed after freeing Johnny Sands, look at Daphne and you can see her tights are missing. They reappear when we see her with the gang a little later on.
Don't Fool With a Phantom - S2-E8
Continuity mistake: In one shot of Fred, Daphne and Velma at the TV station, you can see there are some lights behind Daphne, but when we see a close-up of her, the lights have gone.
Don't Fool With a Phantom - S2-E8
Continuity mistake: When Shaggy says "What happened?" after the Wax Monster appears, you can see there is a seat behind Daphne, Fred and Velma, but when we see the three in the next shot, the seat has disappeared.
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.