Screenshot of Google search for "alexandre pato" on Oct. 15
The hu.wikipedia page for Alexandre Pato has been vandalized recently , and only restored after about three weeks. hu.wikipedia uses flagged revisions, with the last sighted version shown to non-logged-in users; the review log  shows that the vandalized version was never sighted. Despite this, Google's Knowledge Graph still picked up the first few sentences from the vandalised version (see attached image - interestingly, the result snippet is from the sighted version, but the KG snippet is from the vandalized one).
This might not be a bug in the strict sense, but Google being tricky, and requesting something other than the standard non-logged-in HTML version (for example, action=raw always shows the newest version); at any rate, it is annoying (I found out about it from some newspaper article using the Pato article as the example of the unreliable nature of Wikipedia). It would be nice if we could figure out where exactly is Google getting its data from.