Continuity mistake: When the nurse is wrapping a tensor bandage (also known as an Ace bandage) around Kinderman's hand and wrist, the way the bandage is wrapped changes between shots.
Continuity mistake: When Kinderman connects the murder victims to the case in the first movie, he says that the African American kid was the son of the the woman that figured out Regan was speaking backward English. Only when you watch the first movie, the person that figures out what she's speaking is a man that is Caucasian.