Yes, they mention Unobtainium. I think it's a good plug. From wikipedia http://en.wikipedia.org/wiki/Unobtainium
used the term in connection with the nose-pieces and ear-stems of their sunglasses since 198711
and for watches since 2002.12
US trademark laws means that the word is only protected for use in connection with similar goods and services as listed in the trademark registration."
Also it was used in science fiction before Oakley.
By the way, it was a GREAT MOVIE!! Many parts are very heartbreaking. I feel in love with the characters. See it in 3D!