Other mistake: During the quake, we see the furniture, wall panels, ceiling tile, windowpanes, vertical blinds, etc., in the office fall, shake, or crack. Yet the leaves of a large potted plant do not move at all.
Other mistake: As the earthquake hits, outside of the movie theatre, a blonde, short-haired woman in an orange shirt and beige pants is running out of the theatre. A second later, she is pummeled by bricks along with two others and collapses to the sidewalk. Then, she is coming out of a doorway a couple of seconds later.
Other mistake: Early in the movie, at the dam when Fred is found drowned in the elevator, there was not enough water trapped in the elevator to drown him.
Other mistake: Outside of the office building, Stewart and Remy take shelter under a vehicle, despite falling debris crushing vehicles in their midst.
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