Nuke- it's filming a girl taking a picture of the WTC in a helicopter ride.
I think if you pay attention, you may find most people who take rides, tours or other tourist attraction type deals, they bring along cameras of all sorts to document their adventure.
So, I fail to see how this makes it less real.
Second, she says "what is that" when it is in view, but the camera is not zoomed in all the way... however, as the camera is zooming in, the object is clearly visible (a lot of it) by the side of the WTC.
Answer to 3rd question: To save bandwidth, seeing as how this is a 3rd party website, I highly suspect they didn't want to show a couple of people who also don't know what's going on.
-SW