In the episode"Death takes a Halliwell", in the scene when Prue is watching the Fed get killed and Piper & Phoebe are yelling at Prue to open the doors to the mausoleum, there was a crow bar that the deamons put through the door handles to lock it. When the camera moves from Prue to Piper and Phoebe several times, the bar is slanted and then vertical, then slanted again.