Anti-Climax: Yuuko's death in A Tale of Melodies is foreshadowed throughout as a tragedy of tragedies. When it's actually portrayed: She's hit by a car after chasing a ball into the street. Though it could be argued that such a childish act leading to an undignified death was the true tragedy.
Die for Our Ship: There is quite the hate towards Kei for getting in between Hiro and Miyako. Never mind that Kei eventually ends up with Kyousuke anyway.
Narm: The scene in episode 11 where Renji and Chihiro finish their date by kissing and then having sex in the rooftop of the school loses quite a part of its emotion when you see Chihiro's clothes neatly and primorously folded on the floor, as if they were just ready for morning use. Waaaaay to distract the viewer from all of the dramatic tension there.
The Woobie: Damn near everybody, but Chihiro and Yuu get it the worst.