How'd Sam know?

[Essex]

Let me clarify my opinions:<P>A mistake is Pippin sitting in a seat in the Pony when it should have been Merry.<P>A plot error is Sam knowing that they were in Maggot's field when he had never been that far in the Shire before.<P>A plot error is not whether the film is different to the book. What I mean is that the filmakers sometimes MADE plot errors (when they changed the story), but I know of no plot errors in the books.<P>For example, another plot error (I believe). <P>"Aragorn. This is Isildur's heir?" to paraprhase Boromir in the film version Council of Elrond. How on earth does he know this? In the book version, he is told that Aragorn is the heir of Isildur by Elrond, I believe. In the film ,he comes right out and says it without anyone telling him. <P>Book - no plot error<BR>Film - plot error