"Are you referring to the sign of the Deathly Hallows?" -- Xenophilius Lovegood
Harry and Ron bring each other up to date on their adventures, Hermione finds the triangular mark in a photograph of Dumbledore’s letters, and the trio seek out Xenophilius Lovegood at his home for further information about the mark.
Calendar and Dates
Begins the morning after the previous chapter, which therefore dates the action of this one as 27 December 1997.
Interesting facts and notes
I don't even know whether Grindelwald's still alive
As we are to learn later, he is, but not for long (DH23).
You know how much she hates Celestina Warbeck.
Because Fleur spent the previous Christmas at the Burrow with them, and failed to conceal how much she disliked the constant playing of Warbeck's songs, which Mrs. Weasley is very fond of (HBP16).
bore a knocker shaped like an eagle
This, coupled with Mr. Lovegood's evident fascination with Ravenclaw's diadem, suggests to me that he, too, was once a Ravenclaw, like his daughter.
the Room of Requirement on the unforgettable occasion that it had transformed itself into a gigantic labyrinth comprised of centuries of hidden objects
I confess that JKR slipped this little clue right past me.
an old-fashioned printing press, due to the fact that it was churning out Quibblers
As our own readers may be aware, we here at the Lexicon have wondered about how printing was handled in the wizarding world, given their tendency to use magic where Muggles use machinery.
Exceptional character moments
Hermione willing to take a risk and speak to Mr. Lovegood.
"Listen, I've got a feeling you'd be able to tell who lived there if you looked through the Lovegoods' window."
"'You only agreed to try and get back in her good books.' 'All's far in love and war,' said Ron brightly, 'and this is a bit of both.'"
"'Fetching,' said Ron. 'Surprised he didn't wear that to the wedding.'"