One thing that the audiobook sort of slammed home for me was, unusually enough, that the fake Professor Moody was one of the people who tortured Neville's parents. I mean, I already knew that, of course, but it just seemed to resonate through certain scenes while it was being read to me. When Moody/Barty takes Neville aside to give him a book of plants, when Barty is screaming in Dumbledore's memory of the trial, and when Barty is confessing under veritaserum.