there was another thread on this a week or so ago, but I talked to a few people and that letter at the end of the video was either bogus or isnt going to get very far. The FAA was at the filming, so obviously there was permission to fly lower than whatever standards are set. Not sure if the letter was put at the end of the video for shock value or if its real. Regardless, there are no problems that came about from the filming..
and here's that video again.. after hearing what people had to say about it, i wish i was there.
http://www.youtube.com/watch?v=EhTsH8dWtag