Continuity mistake: The rooms Amanda and Billy fool around in are different between the scenes. Earlier they are at Amanda's apartment, with the bed across from a window. Later when she brings Billy breakfast the next morning, the bed is different and there's a wall where the window was previously.
Continuity mistake: Debbie Dobson is looking through a photograph album, the pages she has open have photos of her sister Gemma. The angle changes when Gemma enters the room, just before Debbie turns the page the photos that can now be seen are of Debbie herself. (00:04:45)