During the heavy rains, the Kim family’s half-basement apartment floods. This flooding causes the sewers to back up, which in turn sends human effluent spraying out of the turlet. This, quite literally, is a shitty movie detail.
Furthermore, as the eponymous title suggests, there was at least one parasite in said sewage.
Every time Alex makes his special lasagna he mentions that he didn’t have real cheese. This is a subtle nod that cows are selfish jerks. They flat out refuse to acclimate to the vacuum of space. This is why Garfield won’t leave Earth, sasa ke.
The Belters, people born and raised in the asteroid belt, speak a creole language. Even with the subtitles on, I cannot understand what they’re saying. This is a subtle nod that not only am I an Earther, but so is the subtitle provider. And Google translate.