Board Thread:Naruto Discussions/@comment-5054236-20151006231226/@comment-945885-20151007041336

Virtually all manga have art corrections and changes in the tankobon release. Mangaka have such a short deadline with the weekly chapters that they sometimes are unable to finish art, make errors, or just don't like how the art turned out, so they'll often redraw art for the collected editions. Kishimoto is no different; often the changes are as simple as redrawing unfinished art or adding screentone. Sometimes entire pages are completely redrawn to look more dynamic or interesting.

For what it's worth, the same is true for the anime. Several episodes have improved animation and less censoring in the DVD version compared to the original Japanese television broadcast and subtitled simulcast.