What does Rick Riordan say about the Percy Jackson movie?

Rick has not seen the movie yet as of 2/17/10. He has been writing for a deadline recently and feels that the change in plot from the book to the movie is understandable: he says quote:

"Its always tricky when you take a book and make it into a movie ... I know they have to make changes when they turn a book into a movie because movies are so much shorter and if they make page by page carbon copy of the book on the screen it would be like 16 hours long." (Rick Riordan, NPR Radio, 2/17/10)