Continuity: During a scene where the boss of the TV station is talking to his staff, when he finishes he takes off his glasses and starts to move off his chair. Yet in the next shot he gets off the chair still wearing his glasses.
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Mistakes
Many scenes showing the tidal wave approaching land and buildings is factually inaccurate. Its already stated that the tidal wave will be moving faster than the speed of sound, and reach a height of over 1000 ft by the time it hits land. That being the case, there would be a massive pressure wave of air in front of the tidal wave, that would clear a path long before the tidal wave hits. Buildings would start to topple and crumble before the water struck, and certainly people would not be able to stand in the path of the tidal wave, because the air pressure would blow them away. See more...
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. See more...
Deep Impact (1998)
Directed by Mimi Leder, starring Elijah Wood, James Cromwell, Morgan Freeman, Robert Duvall, Téa Leoni, Vanessa Redgrave (add more)
Deep Impact mistakes
Factual error: When Sarah's family is fleeing Richmond, the highway sign says "Interstate 66." That highway is about a hundred miles north of Richmond; it starts in Washington DC.
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.
Deep Impact 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.
The traffic jam that Leo Beiderman travels through at the end was made up of 2,000 cars and 2,500 people on a not-yet-opened stretch of highway in northern Virginia.
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.