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.
Alternate Character Interpretation: Is the EZIC a heroic group of freedom fighters seeking to liberate Arstotzka from its oppressive regime? Or is it just another group of radicals who simply want to seize power for themselves?
Dimitri didn't leave the player a nice big wad of cash as a thank you.
Demonic Spiders: There are some characteristics that are fairly rarely contradictory, but often enough to result in a good number of citations in the long run if you don't look for it. Probably the worst is height, which is sometimes off by as little as 10 cm (which looks like less since they move up and down a few cm). It's a good idea to align those wall-hanging objects to provide a quick reference for height without having to read those dark little numbers on the side of the wall all the time.
Thankfully, it's easy enough to just use the investigation system to compare a person's height to the one listed in their papers (once you've bought the first booth upgrade).
Ear Worm: The game's droning theme song is surprisingly catchy.
Goddamned Bats: Anyone who gets something wrong verbally (length of stay, reason). If you miss it, boom, citation. If you question them, they will Verbal Backspace 100% of the time, so you have to go through this short rigmarole and it's never a free denial/detainment afterwards.
Incorrect Passport Numbers, which started off as being very obvious, will become extremely deceptive near the end of the game. (Exaxple: Entrant Passport has FCL2X-R89ME as the ID# but another document shows FCL2T-R89ME instead. Or it could alternatively show the same number but with a missing digit: FCL2T-R89M.)
Good Bad Bugs: At least in some versions of the game, smuggling something under their clothes can cause people to be lighter than their passport states.
Paranoia Fuel: It won't be long before you spend the first few seconds after approving/denying someone cringing in anticipation of a citation, especially after you get two that day since any more will carry a penalty.
Scrappy Mechanic: Sometimes, people will come through with the right documents, but won't give you all of them unless prompted. This does nothing but waste time.