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.
One episode of Skyblock, as the trio continues to build and gather items, a 4th player named Ceji appeared in the game (he is an admin of the Hatventures server the trio has open to the public) without warning and it caused everyone else to be confused by it. Once the player left, the trio resume playing as normal without ever mentioning the incident again.
Trials Evolution part 3 causes a lot of these because the party they're in is open to the public and it caused a lot of people to join in then just as quickly leave.
Really only a slight fracture, but most Hatters, when asked, will admit to being loyal to one particular Sir, whether it be the Bearded One, the Walrus, or the Green Fury. Twitter wars have been played with, and the Hatventure forums have established cults inside the archives. It's not so much the base is broken as it's the lines have been drawn, everyone knows who's standing where, and should the Hat Films ever have a public in-fighting, their Hatters are ready for the war.
On a smaller scale, Smith. Some people see him as a griefer, and others as a Jerk with a Heart of Gold.
Their behaviour in Trouble In Terrorist Town, while generally agreed to be funny, has led to some worry in terms of yet another Colbert Bump where people randomly join and begin killing other players for no reason. For context, similar things have happened with SeaNanners and his friends, although the fracture is made significantly smaller by their videos with Sips, where their behaviour is better.
While the guys themselves actually get along well with the Yogscast and have done since before they officially joined, a small portion of the fandom is not happy about them having joined. While the majority seem happy, some of them are worried about a perceived change in content.
Chaotic Good: Smith's ultimate goal appears to be to get a laugh out of the other two any given episode, which is good; but he's willing to try just about ANY kind of joke to get it, no matter how filthy or mean spirited.
Cloudcuckoolander: In an extremely rare case, Ross somehow manages to be both this AND the straight man of the group.
From Filfy' Animals: "Hi, my name is Geoff and I'm a glitchy silverfish. Not much else left to say..."
The main Hatventures theme.
Ensemble Darkhorse: Geoff in the "Filfy' Animals" series has quite the fan base, most likely because he is glitchy and sets everything on fire wherever he goes. On the public Hatventures server, there's a large statue modeled out of Geoff's likeness.
Ho Yay / Faux Yay: If this isn't somehow (jokingly) apparent, you're not watching Hat Films.