Quote Originally Posted by DarthEnder
I think the dub might actually be even better than on TV. I can't be certain, but Naruto doesn't seem to say "Believe it!" as much.
I'm pretty certain they only added in the stuff edited out of the TV versions, and didn't take out previous dialogue. In reality, Naruto never said "believe it" that much anyway, but "harcore fans" decided they didn't like it for whatever reason and completely overexaggerated the matter.

Like you, I can't be certain, but based on what I've heard I'm 99% they made no other changes other than what was edited off of TV.