What is the motivation of the NSA guy? Is he really trying to uncover what's going on or is he trying to cover things up and keep others from finding out what's going on? What did they do with the body of the murdered lady? What is the marker that the researcher found in hers and Cal's blood? I'm assuming all of the passengers have it. I'm surprised we haven't seen the guy Grace was dating before her husband came back. I know we've seen her texting and calling him, but I can't imagine he just completely disappears out of her life like that. I noticed during the scene when she was chasing that lady through the subway area, they ran past a clock that said 8:28.