Continuity: When Bo goes to kiss Jimmy after telling him that he is gay, the facial shot of him shows his head moving to kiss Jimmy by turning to his right. But in the shot when we see behind Bo his head is turned to his left.

Revealing: When Christina Ricci's character picks up the silver knife off the floor of her house and her hand starts to smoke, pay attention to the shadow. You can see smoke coming from her wrist before her hand touches the knife.

Continuity: After Jimmy draws the pentagram on his hand to connect the dots, he holds up his hand to show his sister and the drawing is different from the one shown before. The outline is much darker.

Continuity: When Christina is talking with the blonde girl in the office (after the first werewolf attack) the blonde's hair is down on one side and tied on the other. Right after the last shot of Christina, suddenly her tied up hair is down and flawless.

Continuity: Zipper the dog breaks the front door window by jumping through it to attack Jimmy and his friend. Later when Jimmy and his sister return to the house, the window is not broken.