As a matter of fact I have noticed, especially with Aragorn, and occasionally Sam. But remember, Viggo Mortensen and Sean Astin are American, and the accents are fakes. I think that one would forget to speak with an accents at times. I was in a play once, and played a pirate captain. I had a huge speaking part, and I would be so busy trying to get all of the lines right, I would completely forget about my British/Pirate accent. It happens.
