Audio problem: When Brian escapes his room and the headmaster with security is checking the rooms, if you look very carefully while the camera is going to Brian's room, you can see the headmaster hitting the door with his hand out, but the sound sounds like it would if he were hitting it with his fist.
Twice the Grieving, Double the Loss - S1-E7
Audio problem: When Jake and Lexy realise Devon is at Chucky's house, when Lexy says "What?", her lips don't quite match.