What I really want to know is how did the FBI figure out it was the work of North Korean government agents. Except for a privileged few, North Koreans are completely blocked off from the outside world and would never hear of this movie even if it won more Oscars than the Titanic. Why would North Korea reveal its capabilities and tactics in such dramatic fashion to achieve nothing of any value. It seems to me that all the speculation that was in the news recently about Kim's disappearance from public life and his possible overthrow was far more damaging to the cult of the Supreme Leader than some silly comedy.
Ssssssssssshhhhhhhhhh. You're asking questions, you shouldn't do that.
Just trust the government.