It's not about...
Occasionally, a film is not about what it appears to be about. (Or "a film is not about that about which it appears to be." See Grammar pedantry)
Tinker Tailor Soldier Spy is not, according to Mark, about spies. It is about men who do not trust each other.
Jaws is not about a shark. It is about infidelity (at least, the book is.)
However, it seems depressingly likely that Transformers is really about robots hitting each other. Such is modern cinema.