I don't think any of those are particular minor quibbles. To summarize:
BOUNDLESSINFORMANT: Initial reporting show concrete number on just how much NSA was spying on a whole slew of European citizens. Shortly afterward, the actual intelligence agencies of those countries stepped up and said that those were not reflected NSA spying on those countries, but instead those numbers reflected communications that they themselves had gathered, mostly from areas like Afghanistan, and handed over to the NSA under intelligence sharing agreements.
PRISM: Initial reporting said that the NSA had direct access to the servers of Google, Yahoo, Microsoft, etc., and could conduct data-mining from them without any oversight. Actual story ended up being that those companies were handing over data on specific targets under court order - NSA did not have access to any of their servers.
XKeyscore: Initial reporting was saying that the NSA was sucking up all communications including Americans. The author to the story that I linked to was pointing out that Marc Ambinder had previously disclosed XKeyscore in his earlier book saying that it was a system to index metadata that was already collected using other means, and there was no proof shown by Greenwald or indicated in his slides he published that it had been used to collect American's communications.
The Stewart Baker article: Stewart Baker was interviewed over the phone for the "NSA spying on porn habits" article, but they subsequently left out the core of his argument in order to not undermine their own argument. I thought that spoke to Greenwald's journalistic integrity somewhat - it also puts into perspective the fact that most of the slides he's published have been heavily cropped and there's no way to independently verify the contents of those slides.
The long list of mistakes article: Just pointing that there has been such a rush to report most of NSA documents that most of the initial reporting has had numerous mistakes of varying degrees of severity.
In any case, enjoy your social obligations!