The women keep referring to a "dead drop" to describe the hand-off of the envelope that Molly Blane witnessed. But in spy craft, a dead drop is a location where a message can be safely hidden and then later collected by another agent. The entire point is to avoid physical contact between the two agents so that they don't incriminate each other. This means that the envelope being passed hand-to-hand as Molly saw is literally the exact opposite of a dead drop, and the fact that the hand-off was witnessed and led to them acquiring a copy of the list is proof of why dead drops are used.
Molly refers to the exchange of a blue envelope between two characters suspected of plotting with terrorists as a "dead drop." In a dead drop, one individual leaves the information to be exchanged in a pre-designated location, and the other individual retrieves it later, usually after observing a signal that the information has been "dropped." A cinematic portrayal of a dead drop can be found in the movie Breach (2007).
Bob shows the extremist a fake news program with video footage of the Ted Williams Tunnel flooded with water to convince the terrorist that his bomb had gone off. The video footage of the flooding and smoke coming out of the tunnel is obviously CGI effects done by the unit team. But how did they do that kind of CGI effects in such a short period of time?