I can answer the Orochimaru Edo Tensei question. If I remember correctly, it was a flawed and not complete technique, I think? Can't remember lol

if its a flaws or incomplete jutsu,then even tobirama as the founder of this jutsu can break very easy or without a sweat.not even have to mention this jutsu from hasirama perspective. maybe its a kids play?lol

1. As much as I am aware, Kushina didn't change her name after the wedding, kinda-sorta very opened marriage. Probably Hiruzen just left Naruto with his mother's name (just a theory) to protect baby Naruto from people, looking for the son of Namikaze, the Yellow Flash. But it's just a plot hole.

2. Despite the sacrifice of Minato, people were afraid of Naruto, believing that the chaotic evil chakra of the Nine-tails will simply devour his own and turn him into evil entity. Pretty much they believed the boy is pretty much dead and it's just a shell for the 9tails. This is (possibly) symbolic of how people are blinded by hatred.

3. I believe that people did not recognize the hokages, mostly because very small part of them remember them alive and I hardly believe that the faces on the hills above Konoha are really that accurate representation. Also most of the shinobi on the field are not from Konoha and dont recognize other's villages kages. (DESPITE ON THE BACK OF MINATO LITERALLY WAS SPELLED FORTH HOKAGE!!!!!!!!!)

4.Karin probably either had affinity toward that skill, or was taught to it before meeting Orochimaru, or most likely - PLOT DEVICE and LAZY WRITING.

5. Plot device and lazy writing

6. Same from no one

7b. I believe the technique Orochimaru used was still not refined nor perfected. Kabuto completed it to the form we see in Shuppuuden.

8. I believe Sasuke was either able to increase his chakra pool with the help and training of Orochimaru. Or he was able to train his body to develop better chakra control, allowing him to use less chakra with better results. Or lazy writing.

Pretty much lazy writing.

1. to be fair, on easter culture the wife will keep their last name, and this anime influnce by this easter theme and its fortified by other character on the series they all use their father last name. but i cant agree more its a plot hole.

2. an "evil entity" that scream alot and willingly to share his "will" in the open and quite alot too and loud too.XD, this is a broken logic... i mean hiruzen are crap and failed on so many aspect. he cant make a statement and clear his name from blindful hates?or anybody that involved with 9th tail attack that still alive defending this boy.my lord..... this people has no moral.why do naruto even bother to protect em from mugen tsukoyomi....LOL.. its a joke my friend.

3. dude, these guys are like "president"s or "king"s.. for an example in real life even i never meet first hand the president or a king,but i do know how their face looks like.1 known as the "god of shinobi", 1 known as "the founder of konoha militer, the other 1 known as "yellow flash", and the last 1 known for his ablitity to used all 5 element... i mean they all have books right? and none seem to have a picture of kages, or a hand drawing ... dude they only learn ninjutsu/tai and yet failed to mention those heroes, and other village make jonin/genin trial on konoha like with "gara" on naruto part 1. and their faces are on 60 feets rock!!!! u dont even have to be on konoha to see their faces, its crystal clear from 15km by naked eyes...LOL

4, i think it was mention by back story about hashirama and uzumaki clans. they are known by their sealing jutsu, even the elder that are male can perform sealing justu, so its not exclusive for female, yes kushina was training to be jinchuriki but she is the choosen 1 that are fit to contain kyubi.but she was born with those power, its a jutsu exclusive for this clan cant be perform by other clans.

8, nah, it never been reveal to get a chunk of cakra pool except u have "senju" dna or any kind of "the body power of 6th path". look at kakashi when he train naruto to gain "wind shuriken jutsu", its been explain that he dont have that much cakras. i mean he's 1 of genius ninja and yet even hes awere his limitation but fail to increase his cakras pool, i just think there are no other ways since the story telling us that, well for the case ginkaku or kinkaku... they are not gaining more cakras pool but more like stealing kyubi cakra/natural enegry that contain light and darkness which are superior than other 5 basic elements.... and its never justifed by any characters that they c*e less cakra to perform susanoo,amaterasu or any those lines unlike rasengan variants that can be mini or planet size.

maybe all of this number are tiny plot holes and plot devices, and yeah why they dont use those kinkaku and ginkaku tools to sealing those OP ninjas. XD

Pretty much the answer to most of these is either lazy writing or plot device. Plus, if you recall, Itachi was able to use BOTH Amatersu and Tsukuyomi, despite his Sharingan in it's regular state. However in Shippuden, he always uses it while his Mangekyo ie active. Simple reason is the Mangekyo was yet to be introduced.

Same with Sage Mode. It was yet to be introduced at the start of the series, so that's why Hashirama didn't use it.

Pretty sure that when it comes to surname of Naruto- according to explanations here and there, identity of his parents were kept secret to protect Naruto, that's why he didn't get Namikaze surname and later wasn't told who his parents, especially father, were.

But yeah- hole in it is that people knew that wife of Hokage was Uzumaki- and suddenly a kid named like that appear- and Kushina she was pregnant... so it doesn't take much of thinking to get to fact that he's son of them.

But wasn't it like that- all Konoha's people who knew about all this- were told by 3rd Hokage to never talk about it, never mention who naruto actualy is- not just about tailed beast but also his parents and surname things and stuff. And if he would be given name Namikaze- then people even outside village would know who's son he is and Uzumaki wasn't such greatly remembered name- 4th Hokage was known as hero but who knew Kushina actualy? People from Konoha, yeah.

But also... we're talking about such details, while it's a world where some dude is still alive being chooped to pieces- actualy a talking head- burried under forest... author confirmed that Hidan is still alive btw e.e'

Anyway- it's to hot to think. Let's get some cold drinks and enjoy series and game anyway u.u

@arkoz : yes indeed, but as far how the story goes back and forward that tiny details seem bugging. i think as a whole story, naruto was doing pretty a good job, with minor adjustments, well hey even the legendary dbz have plot holes too, but some what still justified by plot device. and i think the way naruto shippuden end might the near awesome ending if not boruto came out and destroy all of that. its push kaguya clan broken even further. maybe similar to "bleach" after aizen saga....

@taimi : nah.. hidan is near broken for a story telling as it related to orochimaru ego to gain eternal life (even if he was on akatsuki). but i think most of u already know that.

get some ice cream bro... this is a lil chat. don't over thinking it... xp