Jack Sparrow (Pirates of the Caribbean) and Lara Croft (Tomb Raider)
This should be pretty obvious, Korosensei is wearing a hidden leaf headband from Naruto when he teaches Terasaka about who know what.
Soul eater and Fullmetal Alchemist in Barakamon. I just found this on google image even though it's not Assassination Classroom, related.
Watamote has a Kuroko no Basket reference
Why is Kuroko's hair black?
Yugioh in No game no life. Seriously, there are too many easter eggs in No game no life and I do not want to go over every single one. *^*
Dragonball in Assassination Classroom
Shiro reading Shounen Jump (We expected that from Fuwa already so this is a slight surprise)
This can be called an easter egg, I guess?
Kuroko and Akashi from Kuroko no Basket look similar to Nagisa and Karma from Assassination Classroom.
(This is not an anime but it is sort of like a easter egg. )
The game LOLOL played by Yoosung is a reference to LOL, which means League or Legends while LOLOL means League of Loneliness of Life. Poor poor Yoosung without a girlfriend.
By this point, I was distracted by Kuroko no Basket phone covers XD. Too bad I don't have enough money. ;-; .
Anyway, these are all the easter eggs I can find so I challenge to see if you can find anymore!! ^-^
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Anime random weirdness
RandomA little bit of randomness + A little bit of anime = A LOT OF RANDOMNESS FOR AN AUTHOR!! Kano: Even if out math is bad, there is no way that is an equal Bold: Shut up Len: You know he will never Bold: True........... RANDOMNESS ACTIVATED!!