There is a Mikura Suzuki (from Mezzo Forte and Mezzo DSA) PVC figure on the desk of one of the kids,in the classroom scene,when all their things are confiscated by the teacher.
A poster for the movie Blood Diamond can be seen when the two cops are chasing Tsuin.
A CD Soundtrack of Kite Liberator was released on Apr 22, 2008 by Phantom.
The hot sauce that Manatsu Mukai puts in the person's beer is called Spicy Habanero.