Continuity mistake: When Jack is briefing the President, he draws a line on a map of the U.S. and tells the President to have everybody south of that line evacuated. The shape of the line changes between shots. (01:04:20)
Continuity mistake: The first time we see the black bear cage, the sign (and the entire shot) is a reversed image. Twenty five minutes later, we see the black bear cage again and the sign is correct. (00:20:35)
Continuity mistake: When Sam and his two teammates are on their way to NYC for the competition, the airplane gets hit by turbulence. Two attendants go to the back of the aisle with the drink cart, when the plane starts to shake, and in the long shot of the aisle (from the head to the back) one of them is in front of the cart and the other one is behind. However, both are behind the cart in the close up, when they try to prevent the cart from hitting anybody.
Continuity mistake: When Jack is trekking north to Manhattan with two of his colleagues, one falls through a glass ceiling and the other cuts his right hand trying to save him. Despite the fact that we see his hand bleeding profusely, you can see in the subsequent scene that his right hand is just fine.
Continuity mistake: When we see the news report on the TV, you can see that people are taking bottles of water from the shelves. Beside the TV you see a person's hand on the right side of the TV and a black tea flask as well. In the next shot the person's hand is much further away from the screen and the tea flask has also been moved to the opposite side of the TV. (00:35:15)
Continuity mistake: Just after Jack comes out of the New Delhi conference, he is talking with Terry Rapson. At the right of the screen at the stand, there is a guy with a red hat/turban and scarf and no other people behind him with turbans. However, in Terry's close-up the man wearing the red turban has vanished and there are a lot more people in the background wearing turbans. (00:08:05)
Continuity mistake: As the massive tidal wave is rolling through Manhattan, when it cuts to Sam looking at Laura from the steps, the two taxis in front of the library are further away from each other, than in the following shot when Sam has to jump on the cars just to get over them. (00:48:00)
Continuity mistake: When the huge tidal wave hits the bus you see a man standing on top of a taxi, number 7Z22, which gets crushed by the water. Moments afterwards you hear the French woman saying that she left her bag behind. If you look on the right side of Laura you can see a still intact taxi with the number 7Z22 on it. (00:47:30 - 00:48:00)
Continuity mistake: At the end of the movie, when they are all in the helicopter, it cuts to a view of them looking out the window. In this shot, the black actor is sitting next to the window, on the other side of the helicopter, but in the following one, he has suddenly switched seats, and is no longer sitting next to the window. (01:49:40)
Continuity mistake: When on the plane and there's the major turbulence Sam's hair flops over his forehead.Then he looks at the wing and there is no hair on his forehead but in the next shot of him his hair is back messed up. (00:17:55)
Continuity mistake: When T.J. is talking with the homeless black guy who is sitting on the floor telling the student how to keep warm, the guy throws the student a book to rip up and make himself warm. When he throws the book, the student is grasping the book at the bottom with his left hand, but in the following shot his left hand is at the top of the book. (01:16:30)