Well, they really took the whole "we captured and tortured Frodo" thing and laid it out there, hence giving Aragorn a reason to lose his temper (and he is very different from the book Aragorn, of course). Not a very great or convincing reason, because even the movie Aragorn was more restrained and thoughtful than that, but it worked visually,
Eomer is right. And the Mouth wasn't really a guy, was he? He seemed more like a reanimated corpse - a direct extension of Sauron.
I personally didn't how he spoke with a very obvious foreign accent - Middle Eastern, was it? Guess I'm just sick of the "dark, barbaric foreigner" meme. Coupled with the "men of the West line," complete with terrible delivery from Viggo (an excellent Strider, imho, and a pretty bad King), it was just so
blatant, there was no nuance. And I'm as big of a fan of dark, Other-izing tales as... um, other people?