Any thoughts on the following?
What happened to Cobb's totem? Did we see it? All we see is what he says is Mal's totem, and he appears to treat it as though it's his own.
Is it significant that Nolan cast the same actress (Marion Cotillard) who played Edith Piaf in "La Vie En Rose" as Mal -- given that the theme music to "Inception" is based on "Je ne regrette rien" played at 1/10 speed and the song is used to send signals between levels?