aristotle - 5:02 pm on Jan 11, 2013 (gmt 0)
This morning, while checking the logs for one of my sites, I noticed a referral from Google to a page that I removed from the site about two months ago. This was a glossary page that I removed from the server so that it returns a 404. I submitted it to Google's URL removal tool immediately after I deleted it, and it was gone from Google's index by the following day. So at this point it has been gone from the server and de-indexed from Google for about two months.
So this morning I was surprised to see a referral to it from Google in my logs, and decided to take a closer look. When I did a Google search for the same term, which was "widget definition", the definition from my deleted gloosary page was the first result. In fact, it was set apart from the results below it, apparently to get extra attention. (It might be part of the so-called "Knowledge Graph", but I'm not sure.) Of course the link it gave to the deleted glossary page returns a 404, since the page was deleted from the server about two months ago.
So Google Search is still showing content from a page that I deleted and got removed from the index about two months ago, as well as a bad link. Does anyone have an explanation for how this could happen?