Corrected entry: In the scene after the monsters have chased Daphne, Shaggy, Mary Ann, and Scooby-Doo, they are in the vases talking about rescue Fred and Velma. Daphne is talking about them being the damsel in distress, not her, and then she and the vase fall over. When that happens, it's obvious that Daphne is shaking the vase herself so it will fall over.
Corrected entry: This concerns Daphne near the end of the film. When Fred is captured and they call the coastguard she is wearing boots. They wait by the pier and in the morning when they wake she is wearing sandals. When you next see her, when she has been captured and is walking through the caves, when Shaggy releases her soul she is back in her boots.