"Ichiraku," Naruto's favorite ramen shop, exists in real life.
The character of Gaara draws inspiration from Neo because the creator was a fan of The Matrix.
The tattoo on Gaara's head means "love."
In the manga, Gaara wears a red sash. In the anime, the sash is white.
Naruto is shown dumb in series but he gets very strategic during his battles.