You're dealing with high autocorrelation in gridcell temperatures and bristlecone site chronologies, so it's easy to get deceptively high correlations. (climateaudit.org)
Now here's the key chart from DO, comparing the two series to the CRUTEM temperature gridcell at [65 - 70N, 65 - 70E]: (deepclimate.org)
As a result, the phenomena I describe above, with the rapid changes in circulation regimes, are not represented in the climate models at all except as gridcell sized averages... (wattsupwiththat.com)