Revealing mistake: When Adams is inside the trench and dirt begins to pour, he is replaced by an obvious stuntman with a totally different hairstyle.
Continuity mistake: During the quake at the Seismological Institute, one of the men's shirts changes from beige to dark brown between shots.
Continuity mistake: When the car chase ends, the speeding car stops next to a tree. A shot later the car is 10 meters away from it.
Audio problem: When Stewart leaves the parking lot, there's a cop holding a loudspeaker whose mouth doesn't match the audio at all.
Continuity mistake: When the bar is collapsing, the bags of crisps net to the drunk guy appear/disappear randomly between shots.
Revealing mistake: When Denise picks up Corry, he has a silver patch underneath his shirt. Seemingly some sort of protection.
Continuity mistake: When Stewart arrives at Denise's place, a book suddenly appears on top of the books on the second shelf.
Revealing mistake: When the highway collapses, the miniature prop is missing the delineators and lamp posts.
Visible crew/equipment: When the police chases the car, the camera is reflected on the siren.
Continuity mistake: After the quake, people rush down and find a man hanging onto a beam. Sam walks down towards him. Shot changes, and he is several meters behind, walking down again.
Continuity mistake: Miles is attempting to spin through a loop on his motorcycle. The first time he performs the stunt, he drives half way and falls out of the loop and lands on the ground. As soon as he and the bike land, the bike is positioned with the bike's wheels facing away from the loop. Miles is then helped up and the bike has suddenly shifted 180°, with the wheels now facing towards the loop.
Revealing mistake: Near the beginning, after a couple of small earthquakes, Fred comes flying out of the dam elevator shaft with a whole heap of water, dead from drowning. But you can see him lift his head out of the water seconds before his friend turns him over and finds him definitely dead.
Continuity mistake: After the bar where the drunk collapses, there's a scene of an office where a piece of ceiling falls on the left side. A second later, the office is clean and the ceiling falls again.
Answer: There are two versions of the film. A 'film' version which does not include this scene (and others) and a 'TV Miniseries' version. The miniseries version was made to run over two nights and extra scenes were shot to extend the running time.
jle