The ironic thing about those exceptions is that bringing in Barbour's timeless physics is arguably itself one of the errors. In Harry's explanation of how he was able to perform partial transfiguration, there's nothing from Barbour except the phrase ‘timeless physics’; Harry's explication of that, as enforcing a relationship between separate time slices rather than performing a change, is the standard idea of a block universe, going back at least to 1908.
This is a new thread to discuss Eliezer Yudkowsky’s Harry Potter and the Methods of Rationality and anything related to it. This thread is intended for discussing chapter 122, which is the final chapter of the story.
Happy once-in-a-century Pi Day! (3/14/15 == 3.1415)
There is a site dedicated to the story at hpmor.com, which is now the place to go to find the authors notes and all sorts of other goodies. AdeleneDawner has kept an archive of Author’s Notes. (This goes up to the notes for chapter 76, and is now not updating. The authors notes from chapter 77 onwards are on hpmor.com.)