Heh. Yes. Harry has thought about sending a signal to himself and can see through the illusions of dementors. What would happen if he found out about the edits?
I doubt it's going to happen, but it would be awesome.
The kind of simulation that Harry is in (that is, a piece of fiction) is admittedly not one where the initial conditions are established and it is calculated forward from there, such that X2 rather than X1 happening at time T1 necessitates Y2 rather than Y1 happening at time T2.
So, agreed, editing the chapter that describes T1 from X1->X2 doesn't necessarily cause evidence (e.g., Harry's memories) of X1 at T2 to change, so in principle he could notice the difference.
Which would in and of itself be a useful piece of information about the nature of the...
Update: Discussion has moved on to a new thread.
The load more comments links are getting annoying (at least if you're not logged in), so it's time for a new Harry Potter and the Methods of Rationality discussion thread. We're also approaching the traditional 500-comment mark, but I think that hidden comments provide more appropriate joints to carve these threads at. So as of chapter 67, this is the place to share your thoughts about Eliezer Yudkowsky's Harry Potter fanfic.
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. The fanfiction.net author page is the central author-controlled HPMOR clearinghouse with links to the RSS feed, pdf version, TV Tropes pages, fan art, and more, 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: