Naruto's whiskers is missing when he accidentally kisses Sasuke.
In some episodes of the series, some symbols on the clothes that the characters wear have some mistakes on them. Like sometimes, the Leaf symbol on the Leaf headbands would not have the pointy part of the symbol on it, and sometimes, the Sound symbol would have either a wavy flag or a non-wavy flag on it. And the Mist symbols would sometimes be lines instead of squiggly lines. On one of the early episodes, Sasuke Uchiha had a blue shirt with the Uchiha Clan symbol on the back, but on one shot where he talks to Sakura Haruno, the Clan symbol is not on his back. And some of the characters' faces were drawn badly in the original Japanese film, but were edited in the English version.