Edit: I'm a little worried. We know that a lot of fictional stuff in non-HP fiction turns out to be real in this universe. I hope Harry hasn't accidentally triggered something.
I'm having difficulty parsing this. The only interpretation I can come up with is that people have often written (fantasy?) fiction which turns out to come true, and that doesn't seem accurate.
The worry is that in the HPMR universe a lot of things which are fictional in our universe have turned out to exist. For example, McGonagall's references to prior Defense Against the Dark Arts teachers included Professor Summers and Professor Blake. In some cases the situation looks even stranger since Harry has played Dungeons and Dragons (we found that out in the visit to Diagon Alley) but Draco has heard about creatures called mindflayers which are from D&D. Making things worse, we also know that Harold Shea is a real world wizard in Harry's univers...
Update: Discussion has moved on to a new thread.
The hiatus is over with today's publication of chapter 73, and the previous thread is approaching the 500-comment threshold, so let's start a new Harry Potter and the Methods of Rationality discussion thread. This is the place to discuss Eliezer Yudkowsky's Harry Potter fanfic and anything related to it.
The first 5 discussion threads are on the main page under the harry_potter tag. Threads 6 and on (including this one) are in the discussion section using its separate tag system. Also: one, two, three, four, five, six, seven. The fanfiction.net author page is the central location for information about updates and links to HPMOR-related goodies, and AdeleneDawner has kept an archive of Author's Notes.
As a reminder, it's often useful to start your comment by indicating which chapter you are commenting on.
Spoiler Warning: this thread is full of spoilers. With few exceptions, spoilers for MOR and canon are fair game to post, without warning or rot13. More specifically: