- Bonus Material: In 2016, Docomo released through dTV (their mobile streaming service) webisodes (titled as "Extracurricular Lessons") from events that wouldn't be adapted for the second anime season TV airing (due to many production's restrictions), which were originally available for their suscribers until it was announced that they would be getting a home media release in November 2016. Unfortunately, these remain only exclusive to Japan, as of September 2016.
- Cross-Dressing Voices:
- Dawson Casting: In the live-action movie, several of the actors portraying the junior high students of Class 3-E are in their late teens. In particular, Masaki Suda (Karma) of Kamen Rider Double fame and Ryosuke Yamada (Nagisa) are over the age of 20. Only Seishirou Katou (Itona) is an actual 14/15-year-old, the same age as Class 3-E.
- Distanced from Current Events: Episode 3, which featured "a character swinging a knife to kill a monster", was delayed by a week due to a hostage situation in the Middle East. Two Japanese men were being held by hostage by the terrorist group ISIS, and the deadline for the ransom happened to be on the same date (almost right down to the minute) as the episode's scheduled premier. However, due to a mistake by the Australian simulcasting website, the English subtitled version was still released (and pirated) at the normal time, leading many fans to mistakenly think that the next week's episode was actually the one delayed.
- Fake Russian: Lovro, to an egregious degree in the dub. Kent Williams gives him a heavy Russian accent, but his lines are full of figurative and idiomatic expressions that would be unlikely for a non-native speaker to use.
- Fan Nickname:
- The "Omni-Directional Bitch Smack". It's first introduced in Chapter 17 and returns in full force in Chapter 95.
- Many fans have difficulty remembering the names of the numerous Class E students, so they're frequently referred to by their standout trait. For example, Sugino, Sugaya, Okuda, and Kurahashi are known as "Baseball guy", "Art guy", "Chemistry girl", and "Bug girl", respectively.
- God Never Said That: When Chapter 83 revealed the cup sizes of the female students, it caused backlash from the Rinka Hayami fans because they knew that it's impossible for Hayami to have a D-cup. The Shounen Jump redaction admitted that their editors made a mistake and accidentally switched Hayami and Sumire Hara's cup sizes (C-cup and D-cup, respectively). It was later corrected in the tankoubon release.
- I Knew It!:
- Let's just say that Koro-sensei having been human and him dying next March anyway was something that many people had figured out within the first few chapters.
- The reveal that the woman in Koro-sensei's flashback was Class E's previous teacher and/or his The Lost Lenore was also a twist that a good number of fans saw coming from the start.
- A lot of people called it that the end of the classroom civil war was going to be a duel between Nagisa and Karma.
- Image Source:
- Interface Spoiler: The table of contents in the eighth volume has one of the chapter titles scribbled over because it gives away the identity of the southern island mastermind. Episode 21, which covers those events, does the same, actually having two titlecards, one with the person's identity changed to X's, the other with it revealed. Likewise, the ninth volume hides the name of the student who leaves Class 3-E.
- Market-Based Title: The series is called "Invincible Teacher" in the Philippines when it aired on GMA. Averted in the Animax airing, where it is still referred by its original title.
- No Export for You: Eventually subverted. Initially, editors for the American version of Weekly Shonen Jump stated that, despite its popularity in Japan, the series would likely never be released stateside due to the subject matter. However, it has since been released stateside, but only in volume form.
- The Other Darrin: Several different people have voiced Koro-sensei throughout the franchise— Masaya Onosaka in the VOMIC, Tomokazu Seki in the first OVA and J-Stars Victory VS, Jun Fukuyama in the anime and the 3DS game (Assassination Classroom: Grand Siege on Korosensei), and Ninomiya Kazunari in the live action movie.
- The Other Marty: In the broadcast simuldub of Episode 7, Ryuki was voiced by Scott Freeman. After his arrest for possession of child porn, Ryuki's lines was redubbed by Newton Pittman for video releases.
- Portmanteau Series Nickname: Commonly abbreviated to "AssClass". Ironically, the nickname has been said to give off a fanservicy, harem vibe despite the fact that those elements are virtually non-existent in this series.
- The Present Day: Though never explicitly stated, various clues such as days of the week, common technology, and references to events that happen in The New '10s (such as 7:1) pinpoint the story as taking place during the 2014-2015 school year, the same time frame as the middle of the manga's run.
- Relationship Voice Actor:
- Role Reprise: Nobuhiko Okamoto manages to reprise his role as Karma from the OVA in the anime.
- The Wiki Rule: Here.
- Word of Gay: The Official Character Guide reveals Yada to be a lesbian with a crush on Kataoka.
Trivia / Assassination Classroom