ETA: There is now a third thread, so send new comments there.
Since the first thread has exceeded 500 comments, it seems time for a new one, with Eliezer's just-posted Chapter 33 & 34 to kick things off.
From previous post:
Spoiler Warning: this thread contains unrot13'd spoilers for Harry Potter and the Methods of Rationality up to the current chapter and for the original Harry Potter series. Please continue to use rot13 for spoilers to other works of fiction, or if you have insider knowledge of future chapters of Harry Potter and the Methods of Rationality.
A suggestion: mention at the top of your comment which chapter you're commenting on, or what chapter you're up to, so that people can understand the context of your comment even after more chapters have been posted. This can also help people avoid reading spoilers for a new chapter before they realize that there is a new chapter.
As I recall, In MoR, the Marauder's Map is an ancient artifact that's starting to break down a bit, so "Messers Moony, Padfoot, Wormtail, and Prongs" are not Lupin, Sirius, Peter, and James Potter under animagus-based nicknames. Unless Fred and George are wrong about the Map's origins, though being the master pranksters of the MoRniverse (and canon, for that matter) it seems likely that their judgment would be sound in this case. So, evidence that MoR!Pettigrew, et. al. are not necessarily animagi.
I interpreted it that the Messrs put their names on the front of this ancient artefact. From Chapter 25:
By the way, this reminds me that the Twins seem to have found a couple of errors on the map:
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