They could have toned it down a little, but every car seemed to be a brand new caddy. At least they got destroyed and we could imagine Celine Dion sitting in there when they flipped.

There were only a couple Cadillacs, mainly the white CTS and the black Escalade. Although almost every single car was a GM car. I think by Celine Dion you mean Chrysler cars, not Cadillac. I hope Cadillac never stoops to the level of hiring a crack head french canadian no talent ass clown. Led Zeppelin, now there's talent.

As far as the matrix-in-a-matrix theory for Zion, that seems plausable but what about this spin: Zion is another matrix created by a competing machine society to destroy the original matrix machine society. I like that.