Revealing mistake: When the guys are seen piloting the UAV's, they are using Saitek X52 Pro joysticks. These are commercially available controllers for Microsoft Flight Simulator. These were obviously used as props. Even if the army did use these for some reason, they weren't turned on in the movie (the buttons glow green when turned on).
Revealing mistake: Toward the end when they are being chased by the military through the city, there is a quick shot of a military radio in one of the HUM-Vs. There are 2 antenna ports on the left side of the radio (I used to work on them), neither was hooked up to an antenna, yet the radio was transmitting and receiving.