In the scene near the end when Matt Damon's character and Julia Stiles character as well as the other guy are in the room where all the computers were, if you remember, the scene is taking place during the night time. However, when they are in one of the rooms, if you look out the window, it is bright day time, but, then, in a few minutes, the window is dark again, but, then, returns to day light. What's up with that?