Other mistake: 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. (00:37:40)

Terminator Salvation (2009)
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Directed by: McG
Starring: Christian Bale, Helena Bonham Carter, Bryce Dallas Howard, Sam Worthington, Anton Yelchin, Moon Bloodgood
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John Connor: If we stay the course, we are dead! WE ARE ALL DEAD!
Question: What causes the explosion near the start which causes John Connor's helicopter to crash? I may be missing something, but they never seem to address it.
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Chosen answer: It was a strike by Skynet on the attacked facility to try and deny the resistance information and anything useful.
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