99.999% of people would never notice this nor care about it, but a Google Webmaster Help thread has discussion around a very small bug in Google's cache. If you view the cache of a W3 document for a match on xml well formed root, you will notice that Google says they will highlight the words "root" in a red color. But if you scan through the document, you will notice Google is not highlighting that word in red.
Here are pictures:
Googler, JohnMu, thanked the person for reporting it and has submitted the bug to the right team.
I am shocked that it was reported and noticed.
Forum discussion at Google Webmaster Help.
