OK, so I'm listening to the Harry Potter audiobooks for what must be the gazillionth time, and I noticed an inconsistency (yes, there are a number of inconsistencies in the series, but I'd never noticed this one before). In Chamber of Secrets, Ginny's eyes are described as green (last track of disk 1 at about 1:10 if you want to check for yourself), while in Deathly Hallows they're described as brown (when Harry notices that Mrs. Weasley's eyes are the same shade of brown as Ginny's).
Yes, I am a nerd. Yes, I need to get a life. But if I could only learn to use the Imperious Curse on my co-workers, my work days would be so much more fun.