The Night of the Watery Death - S2-E9
Other mistake: After West escapes out of the room where he was tied, he is hiding behind a tall plant by the staircase. There is a person dressed in black lying at the top of stairs who ever so slightly moves. After the fight scene, West attempts to leave from the front door where he is met by the Marquis. When West is backing up into the room, as the Marquis says, "Boys!", one of them is now descending down from the top of stairs - no one is lying on the steps or getting up from steps. (00:31:15)
