In the episode "Homecomings", at 29:22 into the episode, David picks up a picture of his father that was broken by the Hulk. You can clearly see that more than half of the glass is missing out of the frame. Then seconds later, when the camera angle changes, the picture now has all of the glass (cracked) now in the frame, and the broken (cracked) glass is totally in the frame fro the remainder of the shots.