If you watched the Drew Carey episode when Nicole Sullivan and Drew Carey are married and she has two kids, a boy and a girl. Drew tells the girl that when he got depressed he usually went to his basement, so she decided to go up in a tree. Drew's two friends (Louis and Oswald) try to get the girl down and they fall off the roof. When they do, the scene is shot from inside the living room, and you see them falling down if you look out the window. If you watch this, you will notice that the background trees and snow and stuff shakes because they hit the backdrop....oops!!!