Continuity mistake: Right after Marcus gets the Jeep to start, they begin running from the Aerostat. They start off going down a steep hill and the windshield is practically sparkling clean. Once they get to the road at the bottom, the shot shows the windshield caked with mud. (00:34:00)
Continuity mistake: When the Harvester destroys the Saab sedan that is fleeing the fuel station, the car's chassis is shown sailing through the air, stripped of its interior and drivetrain, throwing random sparks, but not on fire in any way because there's really nothing left that would burn. But moments later, it is completely engulfed in flames as it crashes through the awning over the gas pumps. (00:38:20)
Chosen answer: It was a strike by Skynet on the attacked facility to try and deny the resistance information and anything useful.
GalahadFairlight