How do Cobb's projections find their way into the dream, if it's Ariadne's dream, and he hasn't seen the maze? Likewise with Fischer's security projections?
The ending is very interesting for me, personally i think he is still in the dream world, partly because it all seems to much of a 'happy ending' after the histrionics, as well as the fact that we obviously don't see the totum fall, and that the children are in the same clothes, and doing the same thing to all of his dreams, especially the one which Ariadne comes into.
I think the way Mol's death and the blame on Di Caprio is done, is very good. I kept thinking i knew what happened, and then they give you another idea, i originally thought for example, that he had in fact killed her, by accident with the glass he steps on in their hotel room, which he picks up when Ariadne goes there.
Finally - Cobb gets stabbed in the chest by Mol! Why the **** isn't he hurt? And why on earth are they not all dead, having rolled down a hill, and reversed off a bridge.