World generation errors

I was testing 1.7, and I seemed to find a lot of generation errors. For example, there was a big forest with a... complete square of water in it? Also, sometimes in an ocean there will suddenly be a completely flat wall and then a forest or something like that. This probably doesn't only affect the new snapshot, but it's very noticeable in it. This might just be me, it might just be the world... but still...