Bear with me, I am usually more thorough when describing slip-ups, but this time I don't have the DVD and can't remember all the characters names. When the police are searching Taylor's dad's house and her roommate is the only person there, the female cop stays and talks with her while the other officers search the house. When her partner comes back downstairs and shows them he found the murder weapon, and says a few lines. The female officer asks the roommate why Taylor would hide the murder weapon in her closet. The partner never said WHERE he found it, how did she know?