Corrected entry: During specific scenes, volcanic gas is shown to have vaporized several city workers entirely, burned half a workers' head to the point where it appeared coal black, steamed rats, and vaporized Amy's friend. Volcanic gas in real life could burn a subject, but not instantly vaporize them like it did in the movie.
Corrected entry: When Dr. Barnes is down in the storm drain with her friend Rachel, who falls through the fissure, Rachel screams "I'm burning up!", despite being at least several hundred feet above the volcanic gas. At other points in the movie, Roark, his daughter, Barnes, and the subway rescue team are all literally within a couple feet of the lava and show no effects.
Corrected entry: At one point we see a camera's view inside a tunnel with some lava approaching it. The lava then hits the camera, and it shows noise on the screen. However this wouldn't happen, a black screen should have shown because the camera would be severely damaged by the lava so it wouldn't be able to operate any longer.
Corrected entry: This is probably the most blatant mistake in the movie: The lava in the first half of the movie is MUCH hotter than it should be. The speed at which a lava flow moves is determined by its temperature, so lava moving at that speed would be much cooler. If the lava was really as hot as it is in the movie, it would be moving as fast as the lava in the Red Line train tunnel.
Corrected entry: At the start, when we see the two cops pull up outside the church, the cops get out of the car and start to walk past the burnt out car. The cop with the brown hair walks ahead of the cop with the blonde hair, yet in the following shot, the blonde haired cop is now ahead of the other cop. (00:05:20)
Corrected entry: There is a scene where it shows one of the trucks bumping into one of the concrete dividers to help hold it still whilst the lava flows. In a few shots later, the truck and the divider get shunted back by the weight of the lava. Its simply the previous sequence of the truck reversed. (01:08:00)
Corrected entry: Many of the helicopters fly through a heavy ash fall to dump water on the lava. All that ash falling through the air should clog up the engines of the helicopters and shut them down - as was the case with all the police cars that one character said were stuck on the freeway because the ash seized up their engines.
Corrected entry: The blonde volcano expert says something about rocks floating on the molten magma mantle. This is not true; the mantle is not molten magma.
Corrected entry: In the scene where they are allowing the lava to pool, all of the firefighters are in heavy gear, while the reporters are not. The heat from the lava should have been so intense that they would have been heavily burned from it.
Corrected entry: The lava ignites everything it touches or gets near to. Why not the little dog in the house?
Corrected entry: Near the beginning there is a train pulling into (out of?) the subway station and you can see the reflection of the cameraman and his camera in the glass of the train.
Corrected entry: In the scene where all the firemen are standing at and on top of the concrete spraying water onto the lava which is right up against the barrier- as a fireman, myself there is no way they would be able to stand anywhere near the concrete barrier due to the heat and the gases lava gives off. The water being sprayed on would also be useless due to the heat that would make the water evaporate before it went anywhere near the lava.
Corrected entry: When the fireman is swinging the ladder with Tommy, Anne, and the other guy over the lava, the down-the-ladder shots are still, then you cut back to the wide angle and it is still moving.
Corrected entry: After Anne Heche comes out of the hole (after her friend/colleague was burned to death)she takes off her silver overall suit. Her jacket hangs off her shoulders, around her arms. In the following close-up the jacket is over her shoulders again, and in the next scene it once again hangs off her shoulders, around her arms.
Corrected entry: A volcano could never happen in Los Angeles. The earth's crust (and portions of the mantle) are made up of plates, which move about in three ways: divergent, convergent, and transform. In L.A. we have a transform boundary, which means the plates slide alongside one another, accounting for the many earthquakes in California. Volcanoes happen along convergent boundaries, where a plate subducts under another, goes deep into the mantle and hence melts, then rises back to the surface as magma. The entire "Ring of Fire" is made up of such boundaries. As this type of boundary does not exist along California, a volcano is effectively impossible until the plate movements change (which would take millions of years).
Corrected entry: The lava flowing through the Red Line train tunnel was under very high pressure. Why didn't it erupt out of the access shaft that they used to lower the camera down into the tunnel, and for that matter, out of all the other access shafts as well?