As the heads of state decide to open the gates, we see the countdown timer in the background go from 14:40 remaining to 14:39. We cut to a different angle, and it's back up to 14:41.

When Sam is brought to the cemetery to meet Optimus, you can see the green mark on the grass where Sam is supposed to stand while talking to him. (This can also be seen in one of the trailers, 48 seconds in).

After Wolverine arrives at 3 Mile Island he approaches through a thick fog. Above him are a series of conveyor belts that are used at a coal power plant, not a nuclear plant such as 3 Mile Island. The belts are unique to coal mines and coal power plants, and would not be found at a nuclear power plant. The filmmakers obviously couldn't film on the site of a nuclear plant, so filmed on a coal plant to fill in.

When Russel is complaining, when he says "Zoology" his face is covered in dirt. When Carl tells him that he can do his business in the bushes, he is instantly clean. http://www.youtube.com/watch?v=lOjhfcBNZW8.

During the chase in Paris, Storm Shadow is wearing a suit. However, in the helicopter right before his flashback, he is wearing his combat outfit. When the helicopter lands, he's back in the suit.

When Katie wakes up and sleep walks outside, the alarm does not go off. This is weird because they set the alarm and say that it will go off if any doors or windows are opened. "Nothing comes in and nothing goes out".

When Max is going to get K.W. just prior to the Dirt Clod War, his hood is down. When he returns to Carol and Douglas, (just prior to being hit with a dirt clod) his hood is up.

Bella goes to Italy to save Edward. Alice drops Bella off - when Bella gets out of the car to ask where Edward will be, first you see Bella in front of the car door, then she is suddenly behind the car door.

The Fontana dei Quattro Fiumi, where the fourth cardinal is taken to be executed, is nowhere near as deep as it's depicted in the film. In reality it's only little more than a foot deep.

At the end of the Golden Gate Bridge scene, B.O.B. does not get off the bridge before it collapses and no one goes back to save him. But he is seen on the remaining half of the bridge looking down on the scene.