Revealing mistake: When the lava comes through Ruth's house you can see that it's done with CG. The reddish "streaks" look like from a sci-fi movie. The shapes of the lights and streaks are unnatural.
Continuity mistake: 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.
Continuity mistake: When Harry and Rachel are making their way back to Rachel's house after the volcano's initial explosion we see them go down an alley to avoid all the traffic. As they move down the alley we see a pile of bricks fall from a roof and hit the front of the truck and window which causes large cracks in the glass on the passenger side. However, immediately after this we see the car and in all shots from the outside of the vehicle the cracks are no longer visible.Scrappy
Continuity mistake: 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.
Factual error: When being rescued from the crater, Harry tells the helicopter that he is 600 feet below the rim. But earlier, when first the other scientist and then Harry went down into the crater it took a very short time - that could not have been 600 feet. And also from the look of the distance it was more like 150 feet. (00:13:10)Jacob La Cour
Other mistake: When Harry gets out of the truck at the motel to retrieve E.L.F., there appears to be a blue & white storefront sign in the background that is lit, when the rest of the town is dark due to no power. Either that, or it is a really bright, white, non-electric sign that has been completely unaffected by the ash that is coating everything else in town. (01:26:40)juliebellp107
Continuity mistake: 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.
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