Continuity mistake: When Shaggy makes the joke about living without a smart Ape Man, he's lying on his stomach with his legs in the air behind him. His feet are apart as he relaxes. Then suddenly in the same shot, they just jump close together and then slowly spread back apart. (00:06:50)
Continuity mistake: Scooby finds a half eaten hamburger in a plate on the floor. When the camera cuts further back to show Shaggy, the plate has moved on the floor, as noted by the lines between boards and the placement of the plate and the spider web on the wall. (00:07:20)
Continuity mistake: The Ape Man puts on a mask of Scooby and pretends to be a reflection. As he is mimicking Scooby's movements, he places his hand to Scooby's and his nails are sticking up. It cuts to a different angle and his hand is in a slightly different position, and his nails vanish. (00:10:05)
Continuity mistake: Shaggy and Scooby stop to play a game of pool. When Scooby looks up and notices the ape head trophy has vanished, he has 4 of the balls by him, including the 6 ball. It cuts over to Shaggy, and he has the exact same set of balls next to him. (00:14:50)
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)
Continuity mistake: The gang emerge from the secret tunnel and find the movie crew dressing rooms. It shows one, then cuts back to the gang. Then it cuts back and suddenly another dressing room trailer appears next to the one seen moments before. (00:17:20)
Continuity mistake: The director's shown being outside the trailer in one shot after having been in the trailer before and after this shot when they're looking for the missing stuntman.
Continuity mistake: Carl, the stuntman, is shown barehanded in his trailer's trunk in one shot. When he says he's quitting he's suddenly got on ape gloves.
Continuity mistake: When the villain drops the wall flat on Shaggy, it drops with Shaggy going through the window as he stands, then hits the floor. The next shot the flat on the floor disappears, then reappears in the shot after that.
Continuity mistake: When Scooby dons the cloak and hat, there is a blank wall behind him. As he begins running, Shaggy is suddenly with Scooby and a shelf filled with boxes appears on the previously blank wall.
Continuity mistake: A wall flat behind Shaggy with an open window and a closed door is pushed by the villain to fall onto Shaggy, but door on the flat disappears and is now an open space in the wall flat.
Continuity mistake: Velma has her arms spread as she stands in front of the Scooby gang, but nobody is behind her in the next shot.
Continuity mistake: Velma counts off the clues on her fingers close to her face, but in the next shot her hands are at her side.
Continuity mistake: Velma is facing to her right as she holds the engraving plate, but the next shot she is facing left.
Continuity mistake: Shaggy's hands on the violin case change positions depending on whether the case is open or closed.
Continuity mistake: After the villain is caught, Scooby is in the theater rafters, but his spots are missing.
Continuity mistake: The background houses and fences repeat as Shaggy and Scooby carry their pizza home.
Continuity mistake: While Scooby and the gang speak with the doorman, Scooby's spots disappear.
Bedlam in the Big Top - S1-E10
Continuity mistake: The Ghost Clown's lips briefly turn light blue when he's hypnotizing Daphne.
Bedlam in the Big Top - S1-E10
Continuity mistake: Velma throws the umbrella to Scooby pointed end first, but when it arrives at Scooby, the umbrella is handle-end first.
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.