At approxamately 34:45min into the movie, Claire (Tina Fey) Breaks the glass to the door of the realtor's office. The problem is during the face on shot, when Claire puts her fist through the glass, you can see the glass break, and you can see it is regular glass breaking, but when they show the shot from behind, the broken glass changes to tempered, (you can tell by the way it turns white when broken)