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.
Bedlam in the Big Top - S1-E10
Continuity mistake: After the umbrella turns inside out, Scooby loses his grip with the umbrella and falls to the trampoline, but the umbrella does not follow Scooby down.
Bedlam in the Big Top - S1-E10
Continuity mistake: The table behind Shaggy changes color several times as he performs the Lion Tamer act in the cage with the lion.
Bedlam in the Big Top - S1-E10
Continuity mistake: The opening scene shows the clown overlooking the circus tent from a clear bluff, but the closeups show the clown hiding behind bushes.
Bedlam in the Big Top - S1-E10
Continuity mistake: Max the Midget rides Scooby into the middle of the Mystery gang, but the next shot shows Max and Scooby standing apart from the gang.
Bedlam in the Big Top - S1-E10
Continuity mistake: After meeting Mr. Barnstorm, Fred is driving the Mystery Machine from the passenger side, but the next shot from the front view shows Fred driving from the left (driver's) side.
Bedlam in the Big Top - S1-E10
Continuity mistake: Mr. Barnstorm is close in with the gang looking at the ghost clown in the cage, but the next shot shows Mr. Barnstorm alone.
Bedlam in the Big Top - S1-E10
Continuity mistake: The baggage on the back of Samson's tandem bike change colors as the scene plays out.
Bedlam in the Big Top - S1-E10
Continuity mistake: The darts the clown throws at the balloons disappear after popping a balloon.
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.