For some reason humans in this universe are just. The dumbest motherfuckers ever. You do not get to have braincells before you die in this universe. Haters and fans alike may be going "the characters don't have braincells either" and they are right, but being alive makes it worse
Occasionally when the crews are done with a prop in-episode they'll just have it break physics to do something funny. Once a guy in a car chase just slammed sideways into a gas tanker for no reason bc they wanted to end the short.
One of the longest running background characters is a guy named Wally Wackford who talks like a carnival barker. He is so unconnected to the plot they can't find any way to insert him for longer than a few seconds but he's everywhere.
New people to the show are always surprised to learn that white spots on imps are how scars show up. Yeah the piebald thing is NOT a cutesy pattern.
The circus somehow matters more than the actual royal line and being a successful clown is treated like being a massive celebrity, complete with sex toys and jars in-universe being sold of their visage. Yes I mean THAT kind of jar.
You can literally own someone's soul in-universe and powerful beings own a lot of them but MOST of the time it's treated more like being in a really shitty job environment instead of actual slavery. As you can imagine this is where a solid chunk of the discourse comes from amongst other stuff.
Cannibals are pretty chill because their Overlord is big into politeness and manners
Viviene Madrano had a gag of herself getting run over and murdered by accident. She of course died in the family guy death pose.
There's dedicated wikis to background characters because the Spindlehorse animation team refuses to use blank npc background characters so every character is decked out in at least one way or another.
The animation is gorgeous. This isn't me praising bullshit I mean they animate on 1s and 2s and do giant circle shots at least once a season, often multiple. The reason the shows take so fucking long is they spend months on five seconds. You can even argue it's over animated in some sections.
They LOVE cramming worldbuilding in the backgrounds of scenes. Like you miss out on half the show if you aren't pausing every five seconds sometimes. Whether that's /pos or /neg depends on who you're asking.
Blitz, the mc of helluva boss, has so many in-universe haters from his shitty treatment of others they have a once-a-year "fuck Blitzo" party with cake and party favors.
The seven deadly sins all control various aspects of hell and you can usually tell who has what depending on the color schemes/demons staffing the place (also they all have specific sigils), but for some reason Sloth sinners usually have lit candles above their heads instead of a cohesive demon type. They also run the medical circuit.
The running gag of bad spelling is because Blitzo is barely literate and heavily dyslexic. Also it's very likely imps don't get schooling in general.
The sin of lust makes sex toys but also dabbles in prosthetics and robotics in general