Episode Five - S1-E5
Revealing mistake: The mirror over Barnabas' mantel hangs flush against the wall. Yet when he shatters it, the candlestick he throws can be seen to go through the glass instead of bouncing back as it should have done. (00:43:45)
Revealing mistake: When the holder of the nude seminar's handing papers to Louise, you can see that behind the lectern she's wearing underwear. (00:14:00)