The Point Of This Movie
Apologies if this has already been brought up, but I think that this movie has made a very simple yet powerful point.
The teacher is a French teacher (so picture the US equivalent of an English teacher). At the beginning the students are reading a text and pointing out the words that they don't understand. It is the teacher's job to then familiarize the class with the meaning of those words. But what he fails to point out as he gets too caught up in the proper conjugation of verbs and insistence that his students understand "proper" French is that every single word has a strong, powerful meaning and should not be taken lightly.
Then - he uses a word that he doesn't truly understand (of which the English equivalent is "skank"). It is a brief moment - but look what happens just because he uses that one word. Only due to that one tiny word, the entire landscape of his classroom changes and possibly the lives of some of his students. The kid from Mali may get deported. The girl whose eyelid gets split has a transformation in personality and suddenly feels empowered. His teaching career seems to be put on a downward spiral. These are just a few examples.
I feel that is why they intentionally left many questions unanswered. Will Wei's Mom get deported? Will Carl turn himself around? So many more questions as well. The answers could all hinge on such tiny circumstances as the improper use of a word. We all can affect and change the lives of others and not even realize it - especially teachers.
Of course many other points are made in this movie, but I feel this is the primary theme.