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.
Big Lipped Alligator Moment: The Torg Potter storylines are completely self-contained (at least so far), in contrast to pretty much every other storyline which can be guaranteed to have some effect later on.
Ensemble Darkhorse: Lots of characters of varying major-ness. As far as the main cast is concerned, Sasha. At the other end of the spectrum there's Pasquirlio, the squirrel that was Kiki's business partner and turned out to be Donald Trump's living hairpiece.
Epileptic Trees: Just read the forums. Especially about Oasis, whose precise nature has probably been specc'd on more than anyone in history except religious figures and the Doctor.
Fan Nickname: Before we found out anything about it, the 4U City dimension was nicknamed "The Dimension of Rain", rhyming with Dimension of Pain and because it rains constantly.
Hell Is That Noise: Anyone who survives the demon's spawn (a litter of kittens) will forever jump at the sound of "mew."
Hilarious in Hindsight: The arc where the group first meets the Lysindra vampires was funny enough in 1998. Come 2005 and Twilight, and the attack of the vampire Kullen and the fact that Torg has a mind that vampires can't read, and it's hilarious how well Twilight gets mocked.
The use of the Minion Master as a Chekhov's Gun was figured out by the forumites fairly easily.
This trope is the reason the forum has a separate section for fan theories that Pete Abrams does not look at.
Like You Would Really Do It: Pete had told the fanbase for years that Zoe was going to die. By the 4U City arc, she was brutally burned, drugged into a coma, and Riff was told that she cannot survive off of the machines keeping her stable. However, this information has been relayed to him through a character known for duplicity and the use of a surveillance tape. Eventually, Riff used time travel and nanobots to bring her back.
Played straight and subverted by the same action: Oasis murders Monica, someone the readers know is an evil spy trying to bring about the downfall of the main cast. However, nobody (including Oasis) knew this fact. And up to this point, Oasis had not done any permanent damage to anyone the main cast would identify as innocent, meaning that for many of them (and Oasis herself) the event has become a Moral Event Horizon. Her true Moral Event Horizon came when she burned Zoe alive.
This could also be seen as the end of an extended MEH crossing by Dr. Schlock, who not only set Oasis off again by ordering the death of Feng, but manipulated Riff to go against Oasis, and blocked out Torg's call to Riff thus depriving Riff of vital information.
Bestseid crossed the horizon when it was revealed he has been feeding ZHOAS (Jane) brains again. Made even worse by the fact that they are probably the brains of "innocent" random minions. Either way Jane is crazy enough when lucid that this is a bad thing.
Seasonal Rot: Opinion varies on where it started, what exactly's been going wrong, or whether it's still "good," and while many people feel that it's nowhere near what it was in the nineties and early 2000s, others think that despite the changes it's just as good as it ever was.
Also, some believe Zombie-Head-On-A-Stick is quite pitiable.
The Writer Thinks of Everything: The forums are always filled with much debate as to how much is really Pete's advance planning and how much is just Continuity Nods. The explanation of how a character who made his debut by suddenly arriving in Timeless Space got there (along with another character from the Oceans Unmoving arc) seems more like the latter. The big reveal about Oasis, however...definitely the former.