Factual error: No electricity, yet the washer is running.
Factual error: In the Scene where they just finished having sex, Kara calls and tell them that Michael is in the house. But when Kara calls, the girl picks up, but she picks up a cordless phone. But there's no power, the hand set will work on the battery but the base needs to be plugged into a power source to make and receive calls.
Factual error: When Tommy arrives at the bus station, he goes over to the payphone and sees Jamie's blood on the floor. Considering it's been there all night, it shouldn't still be bright red like it just happened. Blood gets darker as it ages.
Factual error: When Tommy is in the phone booth, there's fresh bright red blood on the floor. Since it's from Jamie it would be dark brown by now since it's been there all night.
Chosen answer: In the extended version, it is revealed to be Michael Myers.