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.
Alternative Character Interpretation: An Epileptic Tree-ish one about Leo Quintum has become an almost essential part of the story's mythos on the internet after being pitched in an article by Cole Moore Odell. If you've finished the story, check it out.
Epileptic Trees: Many believe Leo Quintum is Lex Luthor, having travelled backward in time from after the end of the series where he briefly copied Superman's powers and Went Sane From The Revelation.
Hype Backlash: When the introduction to volume two contains a promise that chapter ten proves Superman is cooler than God, well, this sort of hype has lead some fans to hold the story to an unreasonable standard.
Rescued from the Scrappy Heap: In the sense that the story allowed Morrison to use some of the concepts from his aborted Superman 2000 pitch and bring back his DC One Million continuity.
Angst? What Angst?: Superman, upon learning that he's dying, merely proceeds to quietly put his affairs in order.
The same applies to Lex concerning his imminent execution.
Harsher in Hindsight: As mentioned on the main page, writer Dwayne McDuffie died suddenly of complications from emergency heart surgery the day before the film was released on DVD. Made all the more poignant because the film concerns Superman facing his mortality, and he had been giving interviewsabout the film mere days before.