When the camera pans back rapidly as Buffy looks upon the crying girl with confusion, a large stage light is clearly visible on the left hand side of the screen.
When Katrina's stunt double starts to tumble down a hillside out in the woods, you can see a leaf-covered tarp that conceals the safety mats dug into the ground to cushion the stunt woman's fall wrinkle up and start sliding down the hill with her.