When Dennis Quaid's character is walking in the snow to find his son he is attached to his two other colleagues. At one point they realize that they are on top of a glass sky window of a mall. The last of the three guys falls through the glass and is hanging there from the cable. The camera then shows the second guy trying to hold up the third. If you look, you will notice that the second guy is on top of a beam running opposite his body. Then the camera goes outside the mall showing Dennis Quaid push away the snow and look through the glass to see the third guy hanging. Then they go back to showing the second guy and he's not lying on the beam anymore but on all glass. The glass starts to crack below him which is why the third guy cuts himself free. But wait, I thought he was on a beam before... Oops!