When the Demon Farmer towers over Scooby and the Secret Six, the lower spot on Scooby's left leg is brown.
During the Mystery Machine and the demon tractor's face off, the Mystery Machine's front tire changed from green to orange.
As Shaggy tilts his head from looking at Velma talking about the beneath the farm not being a burial site then looking the Secret Six running to hidden door, the frame of Shaggy's eyes looking at Velma is still kept in the new frame, giving Shaggy two pairs of eyes.