Errors made by characters (possibly deliberate errors by the filmmakers): Before Blackburn misses the rope, there's a Somali with a RPG launcher running upstairs. He holds it over his shoulder while it's still unloaded, clearly visible even for himself as the missing RPG can't be overlooked. It wouldn't make much sense to carry the weapon "ready-to-shoot" when it still needs to be put down and loaded, assuming the shot is more or less skilled.
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