Much of the cast & crew were pleasantly surprised by Tom Felton's very convincing American accent, since they only remembered him from the Harry Potter movies where he used his normal accent.
Both Kate Mara and the real Megan Leavey were born in 1983 and grew up in the suburbs of New York City.
At 4:21, the real Megan Leavey first appears at the pull up tower. She's the DI in the maroon T-shirt, not wearing a Camelbak. She appears again a few seconds later at 'the wall' motivating Megan Leavey to go over it.
This is Edie Falco's second time playing a character named Jackie, the first being the main character and namesake of Nurse Jackie.
Second movie in which Ramon Rodriguez plays a Marine. The first was Battle: Los Angeles.