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.
Anvilicious: Blitzball is an allegory for war. Thankfully the book doesn't dwell on this and the whole scene is still pretty funny.
Big Lipped Alligator Moment: During the film version of the 'trial', the boys sing "Hitler Has Only Got One Ball" to their own tune for no apparent reason.
Tear Jerker: Given its themes, the entire story can count as this, especially on repeated readings. Especially sad are the scene where Gene learns of Finny's death—it's not milked for drama at all, but just the subject matter makes it heartbreaking—and the very last page of the book.