John Connor: I knew it. I knew it was coming. But this is not the future my mother warned me about. And in this future, I don't know if we can win this war. This is John Connor.
When Marcus, Kyle and Star are at the petrol station, a flying HK and the giant Harvester robot are able to appear just outside without making any kind of sound. In every other scene of the Harvester and the HKs however, they both make an incredible amount of noise.