Other mistake: After the first guard at the chemical plant is sniped, the second guard goes to check on him and is surprised by the sudden appearance of an attacking helicopter. Helicopters are extremely loud, and flying as low as it was depicted would also vibrate the ground and the building. There's no way it would have been able to sneak up on the guard like that.
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Trivia: The timer on the bomb is a rotary kitchen oven timer. Amazon sells various types identical to it. I've got one myself. Not necessarily a mistake, because the bomb seems to be somewhat improvised, but still amused me.
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