Continuity mistake: As Bobbi sends the Chatter Beast back to Hell, she holds up the puzzle box and shouts "Does this pathway work both ways.?". As she says this, the shot zooms in and then back out and as it does the puzzle box changes position in her hand. In the wide shot, she is holding it with the large gold dial pointed at the Chatter Beast, but in the close up shot, it is a small brown circle pointed at the Chatter Beast.
Continuity mistake: The blades on the chain open up and then get pulled through Merchant's neck causing him to be beheaded. As he gets beheaded his hands were grasping the chain so when the chain gets pulled through, his hands should be sliced in half at about mid-palm to sever the fingers. As his body falls the finger half stays firmly attached to the rest of the hand as if there was no cut.