Revealing mistake: Bad guy is shot but can be seen breathing afterwards on the ground. At the start of the next episode, he was shown to be shot in the head. (00:40:38)
Revealing mistake: When Dan is shot at the end, you can see protective equipment under his shirt as he falls back. (00:40:40)
Chosen answer: Nobody knew, not even the writers, until at least halfway through the season when they were writing the end. They wanted to keep all options open.
Nick N.