Factual error: In the scene where Paul and the National Gurardsman are leaving the motel for the final time after packing up, Paul follows the two Humvee's out of town. Being a Guardsman myself, I know for a fact that all civilians would be in front and Humvees would be following them. It is standard operational procedure.

Continuity: The watch of one of the councilmen shows 1.40. (the stubby one in the white shirt, the one that tries to get the investor to invest in the city). Some 18 seconds later it shows 1.45.

Continuity: Just as Grandma jumps out of the boat you see Harry move towards her. You can see (and hear) his foot hit the bottom of the boat, when just before, it showed the boat almost completely full of acid.

Factual error: When Harry finds out that the water reservoir has been polluted he goes to the hotel room of his friend. He tells him that he has finally found a proof that the volcano is going to erupt very soon. He goes into the bathroom an opens the water tap. The water that comes out of the tap is brown. I think it would have taken at least some seconds or even minutes until the (clean) water that is in the water pipe has come out and the brown, stinking water would follow.

Continuity: When they get in the boat to cross the lake, they notice dead fish floating on top of the water. On the other side of the lake, there are no dead fish.