If you go to the scene where Sarah gets killed, she is called by Roman and he says his script is for his movie called "Sarah gets scewered like a f***ing pig" and she freaks out. She tries to go out the front door but she can't so she goes into a random room that has a bunch of ghostface costumes in it and tries to hide. It just so happens that the real ghostface is hiding in that room on the racks. Now I'm not sure why they did this, but there were a few more rooms she could have gone in but didn't and Ghostface knew exactly what room she would go in. They should have thought this through before they went ahead and made her go in there.