Audio problem: She's holding a suppressed AR-15 type rifle made to look like a mk12 mod 1. When she fires the shot it sounds unsuppressed. Firing a rifle with a suppressor is still loud but hearing safe, this shot required hearing protection. (01:39:00 - 01:40:30)
Other mistake: The weapon which the gunman is holding is a WWII era Nazi MP38/40 submachine gun. The weapon from the magazine housing to the end of the barrel (muzzle) is completely bent down about 25-30°. There's no way the weapon would shoot as straight as it was shooting earlier if at all. I highly doubt the firing pin/bolt can even make contact with the primer of the bullet in the magazine. The weapon looks cartoonish if anything. (00:48:30 - 00:50:00)
