Crowning Moment of Awesome: Modesty Rabnott saving a Golden Snidget and releasing it back to get to the wild. She was fined and lost her house, but she still saved the snidget, went on to continue protesting the treatment of the poor creatures and set a precedent that persisted for over a century. They even named a nature reserve for her!
One of them being a player proposing to the other team's captain after being defeated by her team. She replies by hitting him with her broomstick.
Some of the Obvious Rule Patches are hilarious. For example, you're not allowed to decapitate a Keeper with a broadsword, attempt to murder the referee, or turn a Chaser into a polecat. Yes, Quidditch has rules against that.
Then there's the Marsh Witch's diary, which consists entirely of Tuesdays. The book quips that the onlynote non-Quidditch related interesting information to be gleaned from it is that she seemed to only know a single day of the week.
In the introduction, Dumbledore shares his advice about not mistreating Madame Pince's library books. He once absentmindedly doodled in a borrowed book, and the book retaliated by beating him on the head.
Fridge Horror: The infamous Quidditch match of 1492 broke every rule that has ever been written for Quidditch. As the above states, the rules include "no murdering the referee" and "no decapitating a keeper with a broadsword". There is a disturbingly good chance that these rules were broken. And do any of the rules involve attacking the audience?
Paranoia Fuel: Dumbledore can't guarantee that he's removed all the anti-vandalism curses on this book, so treating it roughly may result in Madame Pince appearing in your home and demanding a heavy fine.