Continuity mistake: When the devil is falling apart and his 2nd ear falls off, he tells Nicky he cannot hear him, and asks the demon by his side who catches it to put it back on his head. But towards the end, when the devil is reduced to no more than a mouth and 2 arms, he is able to have a conversation with his demons about what's going on and hear them perfectly.
Continuity mistake: In the movie someone says "listen to this" as he holds up a Chicago album. The song playing is "Does Anybody Really Know What Time It is?" That song is from the Chicago Transit Authority album. The album the actor holds up is Chicago V.
Continuity mistake: Durring the second encounter with the blind man, after Nicky and Valerie bought their ice cream, watch as the blind man runs into the light pole and in the backround Nicky and Valerie are turning the corner. In the next shot Valerie and Nickie are turning the corner that they have supposedly already turned.
Continuity mistake: When the devil starts deteriorating, the first thing to fall off of him is his pinky finger. Later, when the devil is deteriorated down to two arms and a mouth, he has two thumbs and eight fingers.
Continuity mistake: When Nicky and Valerie get ice cream, Valerie orders a vanilla cone, while Nicky gets chocolate. However, when we see them later, around the time when they meet up with Adrian, you can see Nicky's cone at the bottom of the screen and he has vanilla instead of chocolate.
Continuity mistake: All throughout the scene where Nicky changes the Coke the latch on Beefy's collar keeps moving around.
Revealing mistake: When Nicky shoots goodness at a group of demons, one of them bites off a part of one of the rabbits. In the last shot of that demon, it is extremely obvious that the bunny that he is holding is a stuffed animal.
Audio problem: When the demon pulls the devil's pinky off a demon says "gross" but his mouth never moves.
Visible crew/equipment: In the church scene, when the priest stops dancing on the pizza and the camera goes up you can see in the left middle of the screen a camera just poking out as when the priest talks it goes right to him.
Continuity mistake: When Nicky is floating in front of Valerie's apartment, you can see that she 's holding a small teddy bear. Whenever the scene cuts back to Valerie, the teddy bear changes position everytime.