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.
YMMV: The Harmonverse
Acceptable Targets: Justin Bieber and Twilight are the commonly accepted ones, although each author has their own batch of targets to sling Take Thats at.
Harsher in Hindsight: In Acafellas Daniel uses Oscar Pistorious as an example of people who are different still being able to do amazing things. Since Pistorious was convicted of whether or not he killed his girlfriend, this is since a bit more harsh.
Any jokes made at Finn's expense after Cory Monteith's death in July 2013.
Gone Rampant has said that there was an alternate ending to the Ballad chapter, where Daniel mocks Quinn for being kicked out of her home, but got rid of it because he thought that even Daniel wouldn't go there.
Jack averts it in Wheels by choosing not to make the call to Burt.
Seasonal Rot: Gone Rampant has stated that he believes this to happen to Glee after Season 1, and noted that if/when he gets to it, he'd probably spend most of the time screaming in rage.
He later retired from the Glee fandom less than halfway through Season 1, but will stay and read other stories in The 'Verse.