Peter Jackson's and Fran Walsh's children are listed in the credits as 'Cute Gondor children'. In the Fellowship of the Ring, they were 'Cute Hobbit children' and in The Two Towers, they were 'Cute Rohan children'.
There's a text written in maori: Me mahara tonu taatou nga Uri- aapakura noo tuaanuku nei, noo te waaotuu te tu kekehua ana o ngaa Eldarin kua hohouu mai i te Uru-moana. Which is in english: Let us dedicate our memories to the spirits of the Eldar who came to us from the Ocean that lies to the West.
Christopher Lee, who played Saruman in the film was not originally credited at the end of the film as all the other main characters were because he did not appear in the theatrical version. For the Extended DVD however, he does appear in the film and justly gets his drawn character and name credit with the other actors.