During the written part of his first Chunin Exam, Naruto is required to write down the personal informations of five persons in the room, explicitly excluding his teammates. He starts by himself. When they find out, the proctors actually approve... After laughing over it.
Konohamaru is contemplating how much more interesting a mentor Naruto is and how his lessons were never boring. Mizuko thinks about Naruto when he hears that Naruto participated in the slaughter of an upstart village. Naruto sneezes and thinks someone is talking about him and then realizes he got bit a by a snake.
After Zabuza marries the new Mizukage, Mei, in Team 7, Haku is keeping watch outside their door when he hears a... shout. Misinterpreting, he bursts in, only to be greeted with this exchange:
When Tetsuo is reminiscing on his students' pass cons.
Tetsuo: I can't believe Naruto was able to con that ninja out of 20000 ryo with a chalkboard eraser and string.
Iwa Academy instructor: Best money I ever spent.
In Shippudden, Sakura is rejected by a geneticist to become the mother of Sasuke's children by him taking one good look and replying, "That's natural?!" (He's talking about her hair colour).
Danzo's musings on having to deal with Barako Haruno:
If it weren't for what Sarutobi would do to him if he ordered the assassination of random Konoha civilians because they'd bothered him, he would have given the kill order when he'd gone for his coffee rather than rather liberally laced it with alcohol. It was a pity that Konoha didn't follow the example of some other villages he could name and impose a fine for the killing of a civilian rather than jail time. He could run ROOT from prison if he had to, but it would be damned incomvenient.
They later reach the camp, but the owners, two Suna nin, have returned and, after capturing them, demand the restitution of their stolen radio and supplies. They don't have them, but know who actually stole them: Kisame and Itachi, who are now listening the broadcast of the Chunin Exams. When they see it, the Suna nin try and dispel what has to be a genjutsu, but see it's not:
Itachi: "Quiet. My brother's up next."
Unofficial Shinobi Supply Rule Number 1: any supply left unattended is fair game.
From Shippuden, Danzo's attempt at getting a child created with Sasuke's sperm emotionally attached to him.
In Team Tetsuo, this is how Danzo reacts to learning Sarutobi is reworking the Academy textbooks:
Danzo: "So, no more of that kittens and butterflies crap you've been promoting for the last decade?", sounding almost hopeful.
Sarutobi: "Kittens and butterflies?! As soon as I find that bastard who keeps putting the Academy texts on my desk when I've got three feet of paperwork that needed to be seen to yesterday waiting for me, I'm going to strangle him."
The omake of Team Tetsuo's chapter 29, in which Sakura's parents in this fanfiction meet their anime counterparts. Turns out Barako and Mebuki have counterparts in each other's universe and loathe each other (and Kita regrets not having married his universe' Mebuki, while Kizashi is happy not having married his universe' Barako)... And Kita Haruno believes that Danzo eats people.
Later, Sasuke gives her a look she doesn't like. He suddenly finds himself "benefiting from the wisdom the great Utatane Koharu had gained through extensive experience" until the Hokage tells them the mission desk isn't the right place.
Was the boy seriously questioning the paternity of one of the Kazekage's children?
Quickly looking at where the Jinchuriki seemed to be focused, he realized that the boy had asked Gaara the question. Gaara, whose paternity had been called into question before, in spite of the boy's strong resemblance to his father, thanks to the red hair and the green eyes that were a mark of the Ichibi's possession.
Also, Gaara trying to make sense of it... While revealing that the attempt at brinksmanship constituted by sending him had miserably failed because he had enough common sense to not try and disgrace his village.
Yoroi: "You do realize that Kabuto's going to kill us for this when he gets better, right?"
Misumi: "Come on. If Kabuto were all that concerned about his reputation, he wouldn't have taken the Chunin Exams six times and made himself look like the next Eternal Genin."
In Team Tetsuo Naruto casually mentions there's a Crazy Cat Lady with very aggressive black cats living on Life Street. Confront with Kakashi's excuses for his chronic tardiness and laugh.
Early in First Try, Naruto took to studying the art of traps since he hadn't yet learned Kage Bunshin and needed a specialty, and finds some books written by Madara on the subject. This leads to an incident where Tobi gets caught in a trap inspired by Madara's designs while trying to snoop on Naruto.