Given scene/plot descriptions from movies or TV shows, and given a specific question about the scene, summarize the question into a title

[EX Q]: Criminal Minds S9 Ep2 - "The Inspired (Part II)"  When they make arrests at the end:    There seems to be some difficulty over whether they have Jesse or Wallace. They use his learned nervous tick as a differentiator and arrest him accordingly.   Why would they need to do this?     Surely they could just ask him questions that Jesse would know the answer to (e.g. who are these pictures of? What happens in a normal day at work?) and demonstrate it was Wallace by his lack of knowledge of Jesse's life? Also, the BAU would knew he suffered from hallucinations, if they kept him talking long enough he would eventually give himself away.   Perhaps there is there some aspect of the American legal system that I am not familiar with? Or did miss something in the episode?
[EX A]: Why the confusion over who was arrested in Criminal Minds?

[EX Q]: I'm a bit confused about a scene in How To Train Your Dragon. When the Vikings reach the nest, they open holes and the dragons are flying away. Why didn't they do that in the first place and wait for the humans?  I mean, they had input/output ability from the nest (they could fly to the village to steal some food). Could it be that the queen kept some dragons as "prisoners" and only a subset of the dragons were going to the village, so that they are doomed to get back in the nest, so that they didn't lose their friends (just a thought, not a clue of this in the movie)?  I was wondering if someone could explain this to me or if it really is a plot hole in the story.
[EX A]: Why didn't the dragons leave their lair earlier?

[EX Q]: We all know that Reid has an eidetic memory.  Nevertheless in the very first episode Extreme Aggressor he keeps scribbling into his notebook. Why does he need to take notes even if he will not forget anything?  In later episodes I can not remember seeing him with a notebook.
[EX A]:
Why does Reid scribble into his notebook `Extreme Aggressor`