Look in the scene where the president(Harrison Ford) is spotted by the terrorists and he is walking towards the back of the plane. He thinks he's cornered but then he spots the bathrooms. As the terrorists close in on him, they shoot 5-6 bullet holes through each bathroom door. As they open each door, look at the back of the stall. The bullet holes don't match the holes in the door. They did a good job of putting the same number of bullet holes, but no where near the same pattern. Whoops!