Continuity mistake: When the Haxenpaxen dies, its head is lowered and tilted down. But in the next shot of it, its head is straight up. It goes back to being tilted down.
Continuity mistake: When John puts the box with his wife's ear down, it's left open. When Reynard picks it up, the box is closed.
Continuity mistake: When Quentin grabs the shock stick, he's holding it with his left hand. When it switches to him saying there's only one way to prove it, the stick is now in his right hand.
Continuity mistake: When Kady and Zelda are about to enter the poison room, Kady uncorks the bottle of insects and in the next shot the bottle is corked again.
Continuity mistake: The martini glass Elliot was drinking changes to faux Fen's hand with no explanation of how she got it. (00:09:00 - 00:09:25)