Plot hole: The government would have no chance of hiding the existence of the comet for a year. Most comets are discovered when they are very faint, literally thousands of times fainter than Wolf-Beiderman when Leo found it. Long before the events in the film take place, probably even before the government itself would be notified, the comet would have been discovered, an orbit calculated, and people panicked. The whole premise of the first half of the movie is thus based on flawed logic.
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.
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