Audio problem: As Annie is trying to leave Joan's house and she starts to give Annie instructions on how to do the ritual, it's obvious the audio for Joan's lines was dubbed in in post as a lot of her speech doesn't quite match up with her lips. Especially when she's saying "Your whole family needs to be in the house". (01:08:00)
Audio problem: Malory ejects all of the shells in the shotgun to show she knows how to operate it, but the audio clip is of empty shotgun shells hitting the floor.
Audio problem: At the babysitter house, her boyfriend Dave goes out and finds a motorcycle in the garage to the side of the house. He goes in and starts it, revving up the engine loudly. Several shots while he's doing this show the babysitter and the boy sitting in the boy's room reading and they are unable to hear the motorcycle that's blasting its engines loudly. However, moments later when Michael stabs her in that room and she screams, he is able to hear her scream through the house, through the closed front doors, through the yard and into the garage where he was trying to pick the motor cycle back up. How was he able to hear her scream through all that but they couldn't hear the bike which was considerably louder?
Audio problem: In the opening scene, when Christian asks young Elise "How did you know that?!" after the talks about the man who was just executed, his mouth isn't moving. (True, he's out of focus in the background, but he's not speaking).