Continuity mistake: When David and Elizabeth are trying to find the street address 425, it shows the numerals 425 on a porch with steps starting up from the left side, making a 90 degree turn to the left and continuing up more stairs. There is nothing on front face of porch but the numerals, boarding and stair railing. After Elizabeth says, "Not really" the camera cuts back to the porch and stairs but now there is a light fixture and a window or door on the front face. Then we see David going up stairs from the right side. But when we see them leaving, it appears that they come down stairs that look like the ones from the first scene.Sheri Hartman
Continuity mistake: At the beginning of the film when David first sees Elizabeth in his apartment, they both start screaming. The camera shows her screaming but then the angle changes to show the side of Elizabeth and she stops screaming, when it goes back to the front of her she is still screaming.