There is only so much that one can fit into a 2-hour film and still be able to hold the attention of a non-financial audience.
I would strongly recommend that you read the book, along with all of Michael Lewis' works regarding finance...perhaps then you will understand that it is government legal-tendered, central bank-issued, fractionally-reserved bank lent, fiat currency that is the major primary factor behind what caused the rise, and fall, of real estate prices. NOT foreign capital.
And if you thought mortgage debt was bad, it is nothing compared to sovereign government debt...and the same thing will happen to governments all over the "developed" world over the next decade or two.