It is worth noting that the bulk of your Textual Analysis will consist of your own insights, comments, and analyses of the films under consideration.
The research simply adds the extra dimension of a more scholarly approach.
Citing your sources not only properly attributes ideas to their respective sources, but also strengthens the impression that what you are saying and writing fits nicely within a larger body of international film scholarship.
What else can I do?
I could watch all the special features on the DVD of the film.
Some of them allow viewers to turn on a director's or cast commentary while watching. Who better to provide insight on a film than the creators of it?
I could go to the actual site dedicated to the film and see if there is anything useful there. Or perhaps Christopher Nolan himself has a site, which might yield some additional fruit.
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