Yea the walls could be bogus but I haven't seen anything like that for a long time.
Well obviously that's because mtgoxlive changed the scale to be the same for BTC/USD sides of the graph. Before, even when BID side was 3 times higher than the ASK side, they displayed the same height. Now it's adjusted to reflect the actual ratio and you don't have to calculate yourself.
Thanks for the info.