Continuity mistake: At the beginning after the earthquake, there are two hanging lamps in the kitchen swinging a lot. A closeup of Mike shows a lamp barely moving. The next shot shows them moving much more. (00:05:00)
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. (01:14:40)
Factual error: When lava engulfs the streets, aluminum light poles do not melt (it has a melting point of 1,212° Fahrenheit), yet entire vehicles with steel frames melt into the flow (steel melts at 2,750° Fahrenheit). Lava reaches around 2,000°.
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.
Continuity mistake: At the start, when Tommy Lee Jones puts the pan on the table, the distance between the milk and the bowl changes from being right next to each other to further apart. Also, the rug is not in line with the edge of the kitchen table, yet when the dog goes to lick up the egg, it is. (00:03:15)
Other mistake: The subway scene shown at the beginning of the movie during the opening credits is also used just prior to the big earthquake. (00:01:25)
Continuity mistake: At the beginning of the film, Mike pulls off a frying pan of eggs from the stove, if you look at the eggs, there are virtually none in the centre of the pan, but in the next shot when he goes to put the pan down before it drops, the centre of the pan is now full of egg. (00:03:20)
Continuity mistake: When Roark is trying to get a radio, and Emmitt is watching on the big screen in the OEM building, there is a black man behind him who is talking to the guy with the headset on. In one shot the black guy is almost back to back with Emmitt and looks over his shoulder to look at the screen, yet when it cuts, the black guy is talking to the other guy but is not back to back with Emmitt. (00:43:25)
Continuity mistake: Before they build the lava dam, when Mike flips over a map on the hood of a truck to draw on it the map is clear of ash. In the next shot from across the hood the map is covered with ash. The next close up it is ash free again. (01:02:25)
Character mistake: The downed firetruck was referred to as engine 17, however it is actually engine 23.