Go to the part where Gale and Dewey are waiting for Sidney. Gale asks Dewey if he has caller ID on his cell phone. When they enter the closet and find the costume, Gale picks up the voice changer thing. If you look on her hand when it shoes her picking it up, she has blood on it. Well, in the next scene and any other scene, Gale doesn't have any blood on her hand!