Visible crew/equipment: Stage lights and a boom mic or filming crane are reflected on Miles' helmet when he is about to ride on the track.
Revealing mistake: When Miles is doing his act, he is replaced by an obvious stunt with a different skin color and rounder face.
Continuity mistake: When Stewart is about to save Sam, in the wide angle Sam is lying down, both legs opened wide. In the close-up he is crouching next to the railing. This swaps back and forth.
Continuity mistake: When Stewart and Remy stare at the destroyed building, the sky behind is cloudy and dark, but when the shot focuses on them it is a bright and sunny day.
Continuity mistake: When Corry rides his bike towards the bridge it's too big for him, the seat being lower than the handlebars. A shot later the kid is way taller and the bike is tiny in comparison.
Continuity mistake: When Denise escapes from the rolling home, she trips and her jeans get covered in dust. A shot later they're clean.
Revealing mistake: When the group is trying to escape the office building, a woman in pink falls into the void. Watch when she falls and you'll notice that the stuntman's wig flies off (it's to the left of his head).
Continuity mistake: Sam stretches out his right arm to save the man hanging by a girder. A shot later his left arm is stretched. Then a shot later his right arm is extended.
Revealing mistake: When the California Seismological Institute collapses, the old boss is replaced by a much younger stunt. Also, his sleeves swap between rolled up or not and his tie disappears.
Continuity mistake: A huge chunk of ceiling falls right next to the drunk guy, but the very next shot of him shows not an inch of dust around and the exact lighting as he had before the mess.
Continuity mistake: During the quake, Corry is riding his bike on the bridge and loses his balance, then rests his left hand on the bridge. A shot later it's holding the handlebar.
Revealing mistake: When the cattle truck falls out of the collapsing highway, none of the cows move a single inch nor fall off, revealing the real truck was replaced with a miniature prop set.
Continuity mistake: When Rosa exits the cinema a woman in pink with a white purse runs away. Several seconds later she is inside the cinema and is running away again.
Continuity mistake: During the fight at the bar, the bald man is lying against the wall, with a man on top of him. Immediately after, barely half a second later, their positions are totally different: the bald man is away from the wall and on top of the other man plus the surrounding people have changed places and pool cues have appeared out of nowhere.
Continuity mistake: After Adams talks to the farmer, his aide is inside the trench, walking right next to the wooden ladder. A shot later he is four meters away from the ladder.
Revealing mistake: When Stewart climbs up the rope to save Sam, in the wide angles he is replaced by an obvious stunt: younger and with different haircut.
Revealing mistake: When the car chase comes to an end, check the curb where the cars drive over: a small ramp has been placed to allow for the stunts.
Continuity mistake: During the earthquake at the bar, a man in a yellow shirt crashes against the jukebox. A second later he is next to the pool table.
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.
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