Jason Bourne: I know who I am. I remember everything.
Nicky Parsons: Remembering everything doesn't mean you know everything.
When Dewey is introduced and has a phone call with Jeffers about the leak, he is packing away files in a briefcase. On his desk there is a pad of paper beneath Dewey's mobile, and the scripted lines for Dewey's side of the phone conversation are handwritten on the top sheet, not being removed from set prior to filming.
The Las Vegas car chase sequence took five weeks to film, causing the wreckage of 170 cars.