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.
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.
Development Hell: A lesser example then other products. It's very rare that any of the main fanfics are updated either frequently or will set update schedules be kept to. As a way to pass time between updates, the main writers put up Spin Offs to pass time between updates (PACK for Soulless Warlock, Red Vs Glee PS As for Cola Flavoured Sherbet and Gone Rampant, and the works of the Different-Verse for Zero Ben. Frequently lampshaded by the authors when they do update.
Fan Nickname: The actual title should be the Different-Verse because it was Zero Ben's kindness that allowed for Jack (and other characters) to continue on in different stories by other writers, but this title is what stuck for a few writers. This was actually a second attempt after a failed one by Soulless Warlock and two other writers and it has proven more successful.
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.