* DyeHard: Onizuka bleached hair testify of what he used to be and are usually considered improper for a teacher. Also Kunio,to emphasize his rebellious self, a lot like Onizuka himself.
* DawsonCasting: They're supposed to be middle school students, but they look 16.
** They're third year middle school students/ninth graders (Class 3-4 means the fourth class of third year students), meaning they're between 14 and 15. In the Tokyopop translation, however, several characters including Tomoko are inexplicably referred to as 16.
* HeyItsThatGuy: You might recognize [[Manga/GreatTeacherOnizuka Kunio Murai]] as [[IpMan General Miura]].
* HeyItsThatVoice: The English voice actor for Onizuka is SteveBlum, who also did the voice acting for Spike Spiegel from ''Anime/CowboyBebop'', Mugen from ''Anime/SamuraiChamploo'', Roger Smith From ''Anime/TheBigO'', and many other various voice acting roles in anime.
** Fuyutsuki was the debut role for Creator/FumikoOrikasa.
** Among other things GTO boasts having the voices of the main characters of the previous three Gundam series, specifically [[Anime/AfterWarGundamX Garrod Ran]] is [[Creator/WataruTakagi Onizuka]], [[Anime/MobileSuitGundamWing Heero Yuy]] is [[Creator/HikaruMidoriKawa Kikuchi]] and [[Anime/MobileFighterGGundam Domon Kasshu]] is [[Creator/TomokazuSugita Murai]]
* NamesTheSame: Mr. Sakurai, the English teacher and Mrs. Sakurai, the head of school, are not related. In the anime, Mr. Sakurai is renamed Sakurada to prevent confusion.
* RomanceOnTheSet: The live-action actors of Onizuka and Fuyutsuki ended up together in RealLife.
* StarMakingRole: Onizuka was Creator/WataruTakagi's breakout role as a main character.