This is on the episode where Simon had something "bad" in his wallet. The first couple of times you saw Mary, her hair had a small zig-zagged part in it. At the Dairy Shack, it was big, than small at home, and it just kept alternating through out the show!
Another hair slip-up involved Matt. In one episode, Matt was dropping Simon off at Simon's ex-girlfriend's house. While Simon and Matt were talking in the car, the camera showed shots of who was talking. When they showed Simon, Matt's hair was down. But when they showed Matt, his hair was all slicked back. Matt's hair problem alternated for several shots while he and Simon were talking in his car.
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