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.
Alternative Character Interpretation: It could be the taxi driver had not figured out Zane's disguise. He may have just been asking "Are you sick? You don't look well. Do you want me to call a doctor?", in which case he was actually being nice at the time - to a fellow alien.
Nightmare Fuel: This story is a surreal allegory/metaphor of the immigrant experience, including the bad stuff.
The things some of the immigrants were running away from. The main character and his family are trying to escape their city that's being overrun by spiky tentacle things, and later another immigrant tells of his homeland, which is beset by giants armed with vacuum hoses that suck people up into incinerator tanks on their backs.