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.
Crowning Moment of Funny: Calvin spends an entire chapter antagonizing Percy in various ways. These include turning his hair into spaghetti, glaring at him, and threatening him with death for not saluting a wall.
Moral Event Horizon: The Death Eater who killed Natalie was so callous about it that it counts (assuming he hadn't crossed it already).
They Wasted a Perfectly Good Plot: It should be pretty clear to Galaxoid and Nebular that Calvin isn't the Supreme Potentiate of Planet Earth, but they never bring it up. Might be for the best, and it makes it more heartwarming if you're of the opinion that they know this and still want to help Calvin because he's a friend.