Curb-Stomp Battle: Most of Emeraldia's fights, but especially her fight with Naruto's Rival Gary (AKA Gaara) in which he stood up, she used a water jutsu and he died. Amusingly, however, this passage follows the fight:
Mary Sue:"No, I did not feed your lion. Lions are not pets. They are dangerous animals, and I don't want to lose a limb because you were stupid enough to adopt one."
Emeraldia: "Jefff wood neber hert me!"
Mary Sue:"Yes, but I'm not you, am I? You could walk up to the Akatsuki leader and he would immediately start calling you his dream princess. I'm an ordinary person, and probably the only one in this town! Honestly, when I graduate from Ninja Academy I'm moving to a place where the people have sense!"
Gaara is almost never spelled correctly. The worst offender is probably in Chapter Fib when it's spelled as Mario.
It gets pretty bad with Kankuro, too, to the point where it's sometimes almost impossible to tell whether the story is talking about him at all. "Klank" is actually one of the better attempts. And it doesn't help that the apparent Original Character "Brown Boris" seems essentially interchangeable with Kankuro, given how he's listed alongside Temari and later succeeds Gaara as Kazekage.
Sakura is another frequent example in how many ways it's spelled, how often it changes, and how different the spellings are from each other and the actual name.
Sasuke's name goes through a variety of ridiculous spellings like "Saske" and "Wasuke".
The Phonics: Brown Boris vomits up an egg that hatches into one in Chapter 4. It flies away and does nothing for the rest of the story.
Almost certainly. The character of Mary Sue speaking in perfect English and not being a Mary Sue despite being called Mary Sue indicates that the author knows what a Mary Sue is, therefore is almost definitely writing a parody.
And some of the spelling mistakes are just too perfect to be accidental. "Loin" instead of "lion" is almost acceptable, but "Acutesushi"? That could've been the Cupertino Effect if not for the fact that it's Acutesushi and not Acute Sushi. And the addition of completely random characters from other fandoms and a few real life people in the most recent chapters (Twilight Sparkle, Xemnas, Ichigo Kurosaki, the Teenage Mutant Ninja Turtles, Adolf Hitler, Iron Man, Tom Hanks...)
Unexplained Recovery: Gaara dies in Chapter 4 and Kankuro dies in Chapters 5 and 6. Both come back in Chapter 8.
Villains Out Shopping: Danzo and Darkeye go to a movie together. However, the movie is called "How to Take Over the World".