All five characters who get on the elevator have the color red in common: the Mechanic's satchel, the Old Woman's hair, the Young Woman's nails, the insignia on the Guard's uniform and the Salesman's tie are all red. M. Night Shyamalan is known for having red as a prominent feature in his films. See more...
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Factual error: At the beginning of the movie; a person is seen falling from a top floor high-rise. Pushed, thrown or jumping, his is highly unlikely. The exterior windows (those from floor to ceiling, or those that replace traditional exterior walls) would be triple plated, like that of a bank partition (think of 3 car windshields glued together) One would have to repeatedly bang on it with a sledgehammer before it would even crack, let along jump clean through.
Factual error: Detective Bowden's son is ejected from the front of the car and there is a hole in the front windshield. The collision was a straight side-swipe and his momentum should have taken him out the passenger-side window. He would have gone out the windshield if the car had been rear-ended or if they had crashed head-on into something, but the car came to rest in an open field.