Visible crew/equipment: A boom mic is visible at the top of the screen in one of the alternate endings where a mortician comes to get the body of Billy from the coroner.
Continuity mistake: At the end, while Billy chases Kelli, Kelli knocks over a cart of surgery supplies, spilling the material forward. However, a few shots later, Billy is shown picking a scalpel up from the small tin pale, which slid ahead of Kelli. So how could Billy have picked up the scalpel if he was behind Kelli?
Answer: Maybe like him she's also mentally ill, getting it from their mother. Maybe she feels doing this will bring them together.
Rob245