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?
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.
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.
A completely accidental one, but still one that left a bad taste in people's (and the developers') mouths: Due to the way naming works for procedural generated immigrants, one of the strippers could originally be named "Anita Sarkeesian" also the name of a rather-maligned commentator known for feminist media critique. The game devs honestly did not know she existed, as many of the names used are submitted by fans, and when this was pointed out apologized profusely, then made it so the name could only be applied to normal travelers in a later update.
An immigrant's gender can appear to be incorrect, leading to the player having to make snap judgements. Early on, this cannot be disproved one way or the other and so you simply have to go by whether they "look" male or femalenote While you can use the Investigate function to compare the sex on the passport with the immigrant, the hotspot for sex on the passport is very precisely the M or F itself, making this very easy to miss. Even later on, you have to force people to go through full-body scans to prove or disprove their claim. Not only do you run the risk of misgendering immigrants, you can also force them into an invasive searches, only to deny or detain them because their gender identity doesn't match up to their biological sex. It can make transgender players and transgender allies feel very uncomfortable. Then again, that's the point of a lot of the game's choices.
Yet Another Stupid Citation: After getting further into the game and becoming more proficient, you will likely resolve to never allow something as easy and frequent as an expired passport or invalid issuing city to go past your eyes unnoticed. You will just as likely do it again at some point, after checking almost everything else.