SPOILERS ALERT Why was...
... at the end, Kiefer Sutherland's character REVEALING himself to the semi-conscious Farrell in the ambulance that it was him, how was he SO sure he wouldn't later say ANYTHING about this to the police, and why didn't anyone including tons of police officers at the end notice this and how was he also able to walk right past the crime scene with a rifle case without anyone batting an eye lid?
Or was that just Farrell's hallucination?