Naruto has an astronomical error that virtually no one noticed

 In a series as prolific as Naruto, it's absolutely normal for some script errors to slip through the cracks. It is even more normal that some errors happen due to some kind of lack of knowledge by the author about topics that are beyond common sense. For example, the lunar cycle, in the long term, can be difficult to describe.

The day Naruto was born, in the series, was one of the most important days in shinobi history. Not only was it the birth of the most powerful ninja of all time, it was also the day of death for Minato Namikaze and Kushina Uzumaki. It was the day of the Nine Tails Attack on Konoha. And, curiously, the night where all this happened was lit by a Full Moon.

Exactly 17 years later, the Fourth Shinobi World War was coming to an end with the defeat of Kaguya Otsutsuki by the combined efforts of Team 7. On a night curiously well lit by a Full Moon.

And by "curiously" I mean absolutely impossible.

The fact that the moon is full on that date is symbolic for the plot, after all. It took a full moon for Madara Uchiha/Black Zetsu's plan to be executed and the entire planet to be placed under the Infinite Tsukuyomi genjutsu.

The problem is that the lunar cycle lasts around 29 days, or four weeks. That is, exactly 17 years after a Full Moon, our natural satellite would be in another phase.

You can confirm this by looking up the date of the last full moon and comparing it to the same date 17 years in the future with two simple Google queries.

And do you know what that means about the world of Naruto? That's right, absolutely nothing. But nobody bothered to check if the script was astronomically valid or, if it arrived, they preferred not to call.