Here are the correct specs: http://cdn.androidcommunity.com/wp-content/uploads/2011/09/Note-Specs-377x540.jpg
The measurements from the announcement are 146.85x82.95mm. I'm guessing they just put the size for a different phone there by mistake.
http://androidcommunity.com/samsung...-display-1-4-ghz-dual-core-and-more-20110901/
That makes more sense.
It's a massive phone to try and carry around in your pocket.