These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: The Very Secret Diary
Fridge Horror: Part of the reason this story works so well is because something along the lines of this must have happened in canon.
Jossed: After this was written, it was revealed by Rowling that Ginny's name is Ginevra, not Virginia.