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When Onizuka's pant's caught fire, it burned the mark "Death", on his butt in kanji.
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Urumi Kanzaki's left eye is "brown" but her right eye is "blue".
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When Onizuka gets Mr. Teshigawara's name wrong for the 3rd time, there's the sign "Teshigawara" on his back when he walks away.
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Murai stepped on a fermented soybean and got mad at Onizuka, as his face was zoomed in, you can see a mark in his forehead the word "kill" in kanji.
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Somehow Eikichi was able to write Doraemon on his own forehead, with bowling balls glued to his fingers. He was even able to hold his cigarette like this.