I had to reread several early parts -- so I agree on the editing. The one that really stands out is the one with the 7 Harrys. But I had to reread other parts as well. Again, I'm glad to know I'm not alone.

I just assumed that Teddy had stayed with Tonks mother.

I was confused as to Percy's role at Hogwarts. I don't remember there ever being a Hogwarts's employee on the train at the platform end before.