Near the end of the episode, Brooke rips up the photo with Lucas and Peyton next to her. She is in the middle and in feng shui (which Brooke believes in), it says never to have a picture in your room with 3 people in it, as the person in the middle will be separated from the other two, which happened; Brooke was separated from Peyton and Lucas. See more...
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Plot hole: How in the world could Keith be hired as a teacher? Not only is he a college drop-out with no teacher training, Dan mentions just an episode or two earlier how Keith is incapable of using modern machinery (specifically saying how every high school graduate will be more qualified than Keith).