Google's overreliance on spurious anchors
The user does a Google search and gets a preview of the page contents in the results listing. Words from the search query are marked in bold. The user then clicks through to the page, but gets directly to the bottom of the page to a discussion reply that has none of the words the user searched for in it!
Over the last couple of months I have noticed that when Google links to pages on this blog, it tacks on an anchor, which makes the visitor's browser scroll to the part of the page that has that anchor.
Problem is that invariably, Google has tacked on an anchor that marks up a discussion reply, which contents has nothing to do with the search query the user entered. So the user does a Google search, sees a preview of the page contents in the results listing, and is then linked to the page, to a part at the bottom of the page that has none of the words the user searched for in it! I have tried to remedy this by marking up the actual content of the blog post as an anchor, but Google does not seem to care about that.