Visible crew/equipment: When the house blows up you can see the air cannons that provide the effect.
Factual error: The wind and the rain come and go throughout the movie. In the middle of a hurricane? I don't think so.
Factual error: Towards the end of the film when the old man shoots the soldier point blank with a machine gun, the bullet should go through the soldier and the people in front of him.
Factual error: The 2 characters near the end are struck by lightening next to a big tree, the lightning would strike the tree and not them.