There were a few things that stood out here, but of course what Rowling is doing predominantly here is world-building. Diagon Alley is our first real peek into how wizards dress, shop, bank, interact, play, speak, eat, drink, and live their daily lives in general. The portal behind the Leaky Cauldron acts like the wardrobe to Narnia or the rabbit hole in Alice in Wonderland, becoming a passage to a completely different world with different rules in effect, but rules none the less. Rowling creates a highly ordered world, down to how many knutes to a sickle. She gets into the details here, wonderful bits of description that make this section come vividly to life.

Other oddities I notied:

- Hagrid says he flew to the hut on the rock. We know wizards don't just fly (except Voldemort or possibly Harry to the roof of the school... I'm starting to wonder if Rowling changed her mind about this later). There was no broom visible either, so maybe this is just his way of explaining Apparition?

-Green smoke comes from Harry's vault. I find that odd since Lily and James were both Gryffindors and green is so connected with Slytherin.

-If Harry got into Madame Malkin's after Malfoy, how on earth did his measurements and alterations get done first? It's interesting looking at that first conversation with Draco as well. Rowling really goes out of her way to make him the snootiest, snobbiest, most dislikable person possible very quickly (I had a heck of a time retconning that scene in Shadowed Lives, by the way... and yes, I've been writing that a bit lately, so it's not dead, just very, very slow).

-Hagrid is very sympathetic to Harry feeling he won't fit in, most likely because Hagrid sticks out a mile everywhere he goes. Hagrid has his faults, of course, but he's a good character, and I do like him.

-Getting the wand is always such a neat moment. I freely admit that I never drew the obvious line that Fawkes gave the two feathers. I love how she gives us just a bit of wand-lore here, just enough to know cores, lengths, different kinds of wood used, different wands specializing in different things, and of course that the wand chooses the wizard, making it basically sentient, and no one else's will work as well for you. That's a whole lot of information very fast; actually, there's a huge amount of info in this chapter, and yet it never really gets confusing, just massively exciting.