Note: I didn't make up any of these. I found them online. Sorry if you're not a Hermione/Ron fan.
9-year-old Hermione reads Matilda, a book about a smart girl who can déplacer things with her mind. Hermione goes over to the bookshelf and, concentrating very hard, she gets the livres to slowly move.
Hermione found Ron's copy of of 12 Nail-Safe Ways to Charm Witches and wrote little notes in the margins for him to find.
In the sixth movie when Ron mutters "Hermione" in his sleep and causes Lavender to break up with him, he was actually awake. He felt guilty about making Hermione feel bad because of...