Continuity mistake: After Sharpe and Stamper have the argument on the asteroid, Truman says they need the radio back up. When he says this, you see the countdown clock for the asteroid which is at five hours and 12 minutes. A bit later in the film, after the nuke was shut down by a technician at NASA, one of the Air Force Sergeants takes the terminal. In the background, you can see the clock again but the time on it is at six hours and 49 minutes. (01:37:00 - 01:42:50)
Continuity mistake: At the end of the movie, after the asteroid explodes, we see Grace looking through the glass and there are reflections of NASA controllers cheering. The same shot was used earlier in the film to depict Grace looking upset at some bad news. The camera zoomed into the picture a bit, but you can still see one controller cheering.
Continuity mistake: There are two crews boarding their spacecraft, called "Freedom" and "Independence." They are mounting a ramp and when on top, there is a crew member who directs the two different crews toward their ship: "Independence on the left, Freedom on the right." We even see the ships (in their initial launch phases) right next to each other - you can see one right next to the other as they launch. Then, once they're airborne, we see a long shot of the two bright engines, miles apart. (01:03:35 - 01:06:25)
Continuity mistake: During the scene where AJ is playing with cookies on Grace's stomach on the last night before the launch, the car behind them alternately appears and disappears as well as moves around. Best example - wide shot shows them well behind the car, then in a shot of Grace her head's right by the tyre. (00:51:00)Bill McIntyre
Continuity mistake: When the two shuttles are trying to land on the asteroid, the shuttle Independence crashes, and it is shown crashing upside down and sliding across the surface of the asteroid. Later, having survived the crash, AJ and the Russian are outside the shuttle and it shows it sitting on it's belly, right-side up, with the words United States visible. How did the shuttle suddenly flip itself upright when moments before it was upside down?
Continuity mistake: Just after Harry says "prepare the world for bad news," air raid sirens start. There's a panning down shot of some air raid speakers next to a Coca-Cola ad, with a truck parked in front of it. The angle then changes to a shot down the street (same street, same speakers, same Coca-Cola ad), except the truck isn't in front of the ad any more. (01:56:10)Jon Sandys
Continuity mistake: When the astronaut Sharp comes to his senses and decides to disarm the bomb while it is counting down, the digital readout is just all wrong. Bruce Willis is talking to him and the time reads 40 seconds left. After a good 20 seconds of talking, he starts working on the bomb with a screwdriver and the time reads 35 seconds. Next time we see it, it reads 30 seconds, then when the cover that holds the timer is removed it looks like it reads 45 seconds.AidanN
Continuity mistake: When Stamper is banging on AJ's door, a fan and about six cans are on the shelf. In the next shot, the fan has fallen off, but there are only three cans on the shelf.