At the end of the Movie, when the mother gets sucked into the window in the door, her dress is white, her head is turned to the right, and she is a real person. Then they go to Nancy in the car, then when they come back to the mother, her dress is off-white, her head is turned to the left, she is clearly a dummy, and one of the blades on Freddy's glove (which is sucking her into the house through the window in the door) bends, showing that it was made of plastic, not metal.