 PLOT: Katie drives a blue Chevy Corsica that is parked in the  driveway during much of the film. But when the stalker walks out of  the house, the car has disappeared. Russell apparently drives a  Cadillac, because one is parked in the driveway later on, but it is  still parked at his house when he goes to Shawns house. Due to the  details presented later in the film, Russell and Katie do not live  within walking distance of Shawn, making this a clear plot hole.