Heres one that the vast majority of the audience probably didnt know about, unless theyd read about it ahead of time or had a good ear for voices. Yes, thats Galadriel behind that mask. I expect its relatively rare to find a big name actor or actress who would be willing to do this sort of thing. Its especially surprising when you consider that Blanchett was an Oscar winner by this point. So she must have been a really good sport to show up for what is essentially an easter egg. Theres another hidden cameo in this film in the form of Peter Jackson as a deranged Santa Claus. However, hes only onscreen for a few seconds so all but the most ardent Lord of the Rings fans are unlikely to spot him.