Even people with high tech security often don't want cameras on the inside of their house, only the outside. It's also possible they do have a few cameras inside the house, such as the garage or front door, but may only check them if something was wrong.

It is very common to assume a name in the language you are studying. It also makes the Kims seem more sophisticated to the Parks, who value Western/international tutors.

Comedy is a very subjective thing: what's funny for others may not be funny for you and vice versa. Also, not all humour is meant to make you laugh out loud. The absurdity of the premise and several of the situations the family finds themselves in can be considered a dark comedy.

They hint that someone will die or be killed in the movie.