Factual error: While the tidal wave is enveloping Manhattan, there is a scene where Washington Square Park is destroyed. A large arch is hit by the wave before reaching the rest of the park. The problem is the arch is on the UPTOWN side of the park, not the DOWNTOWN side which according to the movie was the direction the wave was coming from.
Trivia: If you happen to have the DVD version of the film, have a look at one of the trailers. In the movie trailer they show the comet hitting the ocean at an almost right-angle. In the actual movie the comet enters the atmosphere at an angle, thus letting the people watch the comet travel to across the sky into the ocean.
Trivia: When everyone gets out of their cars in the traffic jam and watches the comet pass overhead, they were really looking at a crew helicopter passing over. In post production, the helicopter was covered up with the comet.
Trivia: A sorta nice inside joke: At one point when the President is speaking we see a crowd watching the broadcast in New York City's Times Square. A long shot from above shows the crowd in the streets, and a nearby cinema's marquee shows that the cinema is playing "Fire In the Sky". "A Fire In the Sky" is the title of a movie from 1978 about a comet that hits Phoenix. But this is where it gets sorta tricky: I looked the title up, and noticed something: the title of the movie, notice, is "A Fire In the Sky", while the marquee read simply "Fire In the Sky". That is the name of a movie about the supposedly true story of a guy that was abducted by aliens. A inside joke that doesn't work, due to bad research (or lettering).
Question: All of the residents of Eastern United States were informed by the president when the smaller of the two meteors were to strike in the Atlantic Ocean, yet, even with ample time to evacuate away from the area of impact, why did it appear the residents all chose to leave on the final day? (Clogged highways and chaos).