When Onizuka gets Mr. Teshigawara's name wrong for the 3rd time, there's the sign "Teshigawara" on his back when he walks away.
Teshigawara: (To himself) Onizuka, as long as he is there, my world will not become perfect! I need to eliminate him!
Teshigawara: Thinking about Fuyutsuki I'm having an adrenaline rush. If it continues, my blood pressure will record an all-time high. It's gonna be my happiest night tonight.
(Miss Fuyutsuki has arrived after riding to school with Onizuka)
Azusa: It was awesome! I never knew how good it feels to ride a bike. Maybe I should get a license.
Sakurai: So, how far did you two go? You know, with Mr. Onizuka? It's about time you felt comfortable with him. It's wouldn't be surprised if I heard about you having a relationship.
Teshigawara: (On his laptop) I will not forgive anyone who dirties Miss Fuyutsuki's image... because she is my- (The laptop turns off)
Eikichi: (On the floor) Who left an adapter lying around here?!
Teshigawara: It's my adapter.
Eikichi: I'm so sorry, did I erase anything, Mr. Sashitukaigawa
Teshigawara: It's Teshigawara.
Eikichi: No big deal. I'm sure it was just erotic graphics you downloaded.
Eikichi: Mr Saskawcharama!
Ikari Gendo - Neon Genesis Evangelion
After shaking hands with Fuyutsuki, Teshigawara wears white gloves and glasses, like "Ikari Gendo", and also fixes up his glasses on his nose and grins like this character.
iMac - Personnel Computer
When on the phone, Miss Fuyutsuki says that she wants an iMac. The "iMac" is a desktop computer designed and built by Apple Inc.