In the scene where Tiffany is running from Kevin, she is seen in one scene on the floor wearing Dani's Jacket, then she hits Kevin and starts running, but the jacket suddenly disappears, and then reappears later after she passes a couple of trees.
When Kevin goes crazy and Tiffany is on the floor, just before she hits him and starts running, we can clearly see the blade on the floor, but in the final scene, Tiffany's mother dropped the blade while picking Tiffany's clothes.