Continuity mistake: When Amy Barnes and Rachel are in the tunnel trying to find out what happened, Rachel falls in the crack of the tunnel, and Amy is thrown back. When it cuts to a different view, Amy Barnes falls or is thrown backwards, yet in the following shot when her hand slips from Rachel's, she falls back again. Also, when she is thrown back by the force, she is thrown back some distance, yet when the smoke subsides she is only about 1 or 2 feet from the crack in the tunnel.
Continuity mistake: At the Department of Geological Science building, the shot then cuts to a woman saying "I can't". The next is a room full of cameras and a couple of guys standing by the cameras near the doorway, yet in the following shot all the guys have disappeared who were standing by the cameras.
Continuity mistake: When Roark, Anne Heche and the other woman are in MacArthur Park, Roark walks away and Anne Heche is quite a few feet away from the other woman, but then she is right next to her without barely even moving. Also, when Anne Heche puts her hand on the woman's neck, in the following shot she is taking her hand away, and in the next shot she is taking her hand away again.
Continuity mistake: When the train boss sacrifices himself by throwing the train driver over the lava flow, he only just manages to throw him past the flow. But in the following shots where it shows the other rescuers view of the lava flowing toward them, the position of them and the lava coming toward them mean they should be burnt by now.
Continuity mistake: There is a shot of a 'hippy' style car with lots of slogans and messages written all over it, melting, but in a shot much later on, the same car is still in amongst the lava flow, when it should have melted already. You can tell its the same car from the megaphone on the roof.
Continuity mistake: Near the end, Roark and Amy are standing over the grid in the street, and when Roark says something like, "I'm not letting you go down there it's too dangerous," Amy is looking down at the grid in the road, but in the following shot she is looking directly at Roark.
Plot hole: When they are trying to find a way to stop the lava from going in to the museum, Tommy Lee Jones has an idea to push a bus up against the museum to divert the lava. The plan works but the lava does not melt the bus like it melted Tommy Lee Jones' car or the fire truck. Even though the bus melts later in the movie, it doesn't melt it instantly like it did with the fire truck.
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