Corrected entry: In the part where the older mother is getting ready for her suicide by dressing up and putting on makeup she is wearing a one shouldered dress. In one cut the right shoulder is bare, and on the next her left one is bare. Or vice versa. Either way the dress is worn two different ways.
Corrected entry: In one of his speeches, the President says that once the smaller comet hits the ocean, it will take the tidal wave about 45 minutes to reach the shore. But when Jenny and her father is standing on the beach, it only takes about half a minute from the time when the comet hits the water to the time where the wave reaches the beach.
Corrected entry: In the scene where the comet hits the ocean, there is a massive traffic jam just 5 miles from the beach. Since everyone has known about the comet for over a year, wouldn't they have headed away from the ocean a few days/weeks/months earlier?
Corrected entry: Sara's dad put the key for the motorcycle in the jar 3rd to the right. When Leo "steals" the motorcycle he finds the key in the jar 4th to the right.
Corrected entry: At the end of the film, when Tea Leoni's character and someone are standing on the beach, waiting for the tidal wave to come, the tidal wave seems to make a miraculous stop, right before the beach, where as in reality, tidal waves go so fast, that once you've seen it, it has already hit.
Corrected entry: When the Messiah mission withdraws from the Comet to remote-detonate its nukes, the implication is that the nukes must be let off NOW to have any chance of success, and the Messiah is thus caught in the blast and damaged, conveniently putting it out of communication with Earth for the duration of its journey home. They are months away from impact and there would be time to fire up the main drive and make the return burn before detonating the nukes, thus putting a safe distance between themselves and the blast. The only argument against this is that if the attempt failed they might go back to the comet with the remaining nukes for a second try - this is never suggested, so why not get out of there?
Corrected entry: When the President is making his speech at the press conference he says that the as comet had been seen by a Young Explorer's Astronomy Club on a mountaintop in Arizona. Then when everybody's escaping from the coastal areas and it shows Leo driving down the highway looking for his girlfriend there's a sign for Virginia Beaches. Arizona is a pretty long way to go on a field trip, don't you think?