Continuity mistake: When Henry is working on the body, just after the lady is grabbed, In one shot the tray below the weighing scale has some body parts and stuff Henry is adding, in the next shot it is empty, then in the next shot it is full again.
Factual error: Henry states that the car bumper of an 2007 'XJ' is a certain height off the ground and led to a particular injury to a dead person. He claims he knows this because he is a Jaguar enthusiast. He then points to a photograph of the 'New York Kids' in a pre-2002 Jaguar XKR as 'circumstantial evidence' that it was this car that caused the injury. A Jaguar enthusiast would never mistake an XKR for an XJ.