Continuity mistake: In a full view of the Scooby and the gang in the Sheriff's office at the end of the episode, Velma is sitting on a chair and you can see there is nothing beside her, but after a quick cut of the Sheriff, we return to Velma and Shaggy and a filing cabinet has suddenly appeared.
Continuity mistake: When Shaggy asks the gasman if he has any wheels he can borrow, Shaggy is wearing his disguise kit. When we see him on the moped just a few seconds later, he is now back in his normal clothes.
Continuity mistake: In a shot of Fred, Daphne and Velma in the Mystery Machine, Fred announces that they are at Beach Boulevard and you can see that Velma has nothing on her head. But after a quick cut to the radar, we return to Velma and she is now wearing her earphones.
Continuity mistake: When Fred is standing by the slingshot, you can see Velma, Daphne and Shaggy are standing behind him, but in the next shot they have all disappeared.
Continuity mistake: When Scooby bites Shaggy to help him to pull the lever, Scooby's dog collar is blue, but a few seconds later the collar is red.
Continuity mistake: When Shaggy is running after the van after Scooby is captured, he is holding the cut-off lead in his left hand. When Shaggy approaches the man at the gas station, he no longer has the lead.
Continuity mistake: When the Witch Doctor opens the crate and Scooby walks out, you can see the dog tag on Scooby's collar has nothing on it, but in the next shot the letters "SD" have appeared.
Continuity mistake: When Shaggy is telling Fred about his encounter with the Ghost of Geronimo, look at the Mystery Machine behind them and you can see the additional equipment is missing.
Continuity mistake: When Shaggy takes off his bowler hat to catch the flying garbage, the spots on Scooby-Doo's back are missing.
Continuity mistake: When Fred and Daphne arrive at a temple screen, the top lavender strip on Daphne's skirt is missing.
Continuity mistake: When we see Fred holding the picture of Champion in the Mystery Machine, he is holding one sheet of paper. When we see a full view of the gang in the next shot, Fred is now holding two sheets.
Continuity mistake: When Scooby is in Buck Masters' office, he sees a pointer dog on top of a stand and then does an impression of it by pointing his finger and freezes. When the camera closes in on Scooby in the next shot, the stand has disappeared.
Continuity mistake: When Scooby Doo rushes back on to the beach and Shaggy asks him, "What's with you?", Scooby's eyebrows disappear briefly.
Continuity mistake: In the shot of Scooby Doo turning on the radio at the beach, his spots are missing.
Continuity mistake: When the Mystery Machine is driving down Beach Boulevard, you can see Fred and Daphne are sitting in the front seat. When Velma locates Scooby-Doo on the radar using the transmitter in his collar, we cut to the Mystery Machine and Fred and Daphne have now gone.
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.