Where do you get the feature data information from? For some points (I was looking points in the Seattle area / Space Needle etc) the lat/lng data is off by 1 or 2 blocks.
Do you see a systematic error in our data? If yes we would like to know it and report it to google. If only some points are inaccurate you can directly change it on our site using the 'move' link or you can report it to the U.S. Board on Geographic Names.