I disagree. The existence of a Slytherin girl's time-turner was all but spelled out before, which qualifies it as not-DeM. It was difficult to remember (I didn't, until Eliezer pointed it out) because it was a minor passage from many, many chapters in advance, but that only makes it even less of an Ass Pull.
If anything is wrong with that resolution, I think it's that Snape didn't think of that possibility despite being Head of House Slytherin and a master schemer.
A minor flaw: The Slytherin girl who likes to get there first with gossip (in chapters 41 & 46) is named Millicent Bulstrode. But in Chapter 62, her name is Margaret Bulstrode.
- This thread has run its course. You will find newer threads in the discussion section.
Another discussion thread - the fourth - has reached the (arbitrary?) 500 comments threshold, so it's time for a new thread for Eliezer Yudkowsky's widely-praised Harry Potter fanfic.
Most of the paratext and fan-made resources are listed on Mr. LessWrong's author page. There is also AdeleneDawner's collection of most of the previously-published Author's Notes.
Older threads: one, two, three, four. By tag.
Newer threads are in the Discussion section, starting from Part 6.
Spoiler policy as suggested by Unnamed and approved by Eliezer, me, and at least three other upmodders:
It would also be quite sensible and welcome to continue the practice of declaring at the top of your post which chapters you are about to discuss, especially for newly-published ones, so that people who haven't yet seen them can stop reading in time.