Corrected entry: Harry and Rachel call a town meeting because there is danger that the volcano is about to erupt, yet she chances leaving her kids alone at home instead of taking them with her.
Corrected entry: When Harry and Terry are on the volcano with Spider Legs and Terry breaks his leg, they need to call for a helicopter to come rescue them. How did they get up there? I don't think they were able to hike up the volcano, let alone hike up there with Spider Legs and their other equipment. After all, it took 4 people just to get Spider Legs off the rolling cart in the motel parking lot.
Corrected entry: When the helicopter crashes, Harry calls and asks his friend to send for the fire services. Isn't it likely that they are busy in the town helping to evacuate the people?
Corrected entry: If the Mayor and Harry know that the volcano would erupt soon, then why would they run the risk of letting the kids stay up on the mountain?
Corrected entry: The scene takes place near the end when Dalton and the Wandos are in the boat, after the volcano starts to erupt. The water is really acidic and is making the boat disintegrate. When Ruth jumps out of the boat it burns her flesh. Before this occurred and during the boat melting, there were bodies of fish floating all over the lake.
Corrected entry: Harry was able to drive across the lake as the truck he was in was fitted with a snorkel. The other cars that drove into the lake would have immediately stopped as the engines would have hydrolocked. Therefore the car that hit the truck wouldn't have been able to get there in the first place.
Corrected entry: When Harry and the Wandos are crossing the lake which has turned into acid, you can hear the motor coughing right before it stops; and Harry turns the motor into the boat, and sees that the propeller is destroyed by the acid. Even though the propeller is gone, the motor shouldn't just stop, it would still run, but the boat wouldn't move. The director probably did this so that the viewers would understand that the motor was destroyed.
Corrected entry: At the end when they are rescuing Harry from the mine, we see a helicopter land and kick up tons of volcanic ash. Given the destructive nature of ash to the engine (as seen in the earlier scene), it would not make any sense to have a helicopter operate anywhere near the area.
Corrected entry: When Rachel and Harry are crossing the river in the truck, they get obviously very wet. By the time they get to Ruth's lodge, they seem quite dried out.
Corrected entry: When Graham and his sister are driving in the truck, there is ash and dirt falling from the sky. But at the same time when Harry and Rachel are driving in their truck to look for the kids, there is no ash or dirt falling.
Corrected entry: When they are driving to escape the lava, the scene where the dog jumps in and is saved, they are driving through molten lava and their tires don't melt.
Corrected entry: After the dead bodies are found in the hot springs, Harry asks Rachel, "Any idea who they were?" Rachel responds, "No. Never seen them before. Backpackers maybe." Rachel would have no idea if she's ever seen them, as the bodies were literally boiled and burned. (00:20:10)
Corrected entry: When inside the boat going across the lake turned to acid, they are moving at a high speed. But all a sudden when they lose the prop, the boat is at a complete stop and actually turning. 2 problems with that scene. The momentum of the boat at a high speed would have continued moving it forward for quite some time. It would not stop all a sudden. And when he is using his shirt to row the boat, the boat would have turned, because he was only paddling on one side.
Corrected entry: When they are crossing the river in the boat, the acidic water is eating through the blades of the motor, so Pierce Brosnan wraps his shirt around his hand to help them paddle manually, and nothing happens to his hand. Yet when Grandma, in her final heroic effort, leaps into the water to pull the boat ashore, she receives 3rd degree burns all over her legs.
Corrected entry: When Harry notices that the water in town is full of sulphur dioxide it's late in the evening, yet when they start calling for people to meet, it's daytime - why would they wait for so long (till 6 p.m. of next day) if the volcano was about to erupt?
Corrected entry: Harry says that the water supply has been contaminated but when he is at the Town Meeting trying to tell everyone about the evacuation plan there is a pitcher of fresh water on his table.
Corrected entry: After the pyroclastic explosion Rachel, Harry and the kids get into the mine. There are a lot of things from Rachel's son in there: Sodas, chips, tapes and a tape player/recorder among them. There is a shot in which we can see a pile of tapes on the player, in almost perfect order. But if we consider that the whole town collapsed because of the earthquake occurred before the eruption, then those tapes must have fallen down, surely?
Corrected entry: When Harry and Rachel go to get her kids they cross the bridge and all the cars are going the same way - to get out of town. When they find out that the kids went to get Grandma, they go back through the water, since the bridge is packed. A few cars follow their example and try to cross the river - why are these cars going back to the town rather than away from it?