Other mistake: At 1:39:14 the bomb arms, 32 seconds later at 1:39:46 (two seconds after it should have blown up) Dan and Molly jump from the helicopter. Then 10 secs later at 1:39:56, the plane FINALLY blows up after giving them those extra 12 secs to jump and conveniently make it to the pool below.
Factual error: When the elevator falls to the ground it passes a hotel waitress and blows her hair and pieces from her trolley away. In fact the wind gust comes after the elevator has passed, in reality it would come before it passed, as the air ahead of the elevator would be compressed and blown outwards, leaving lower pressure behind which would cause a gust inwards.
Visible crew/equipment: Right after the foot chase scene which culminates in Miles Jackson's girlfriend, Erica, being run over by the truck she falls to the ground. The film's prop crew unfortunately laid the resulting blood trail about six inches in front of her face, instead of under her head where it would realistically be.
Plot hole: Miles arranged the chase with the streetcar, so that Danny would have to take out the transformer and shut down the power in the area, in a way that it would remain shut down. How could he know that the dumb operator would leave the FBI guy on hold for as long as (s)he did? Someone said after the streetcar finally stopped, "they turned off the power."
Plot hole: Danny uses the police Crown Victoria to slow down the streetcar in an attempt to stop it from smashing through the end of the line. There's no way a Crown Vic could slow down the 60000 lb streetcar the way it did in the movie. First, only the front wheels were making contact with the road, and second, the tires would not have lasted as long being skidded as shown in the movie.