Why does blockchain.info say BTC was traded for $35?
In the past blockchain.info got their prices from two sources: MtGox and Tradehill (though in the meantime they have removed the reference to Tradehill from their description). It could be related to that.

Also other media report a peak rate of USD 33, e.g., http://www.economist.com/blogs/babbage/2011/10/virtual-currencies