Other mistake: In the standoff in the bar, Robert Patrick fires about 22 rounds from his handgun, then runs outside without reloading and fires even more into the propane tank under the bar. No way his gun holds that many bullets.
Other mistake: When the glass in the Range Rover gets broken, the front window and passenger window shatters as normal automotive safety glass should. However, the driver's side glass gets broken into large jagged shards, instead of smaller pieces as would happen with any kind of auto safety glass, whether tempered, coated, or laminated.
Other mistake: Why are the guards carrying that useless glass armor? Glass is very heavy, so it is not comfortable; the armor isn't shock proof, because it breaks even if they just fall down; and it isn't bullet proof, because the guy with the AR-15 shoots right through it.