The razor Gwyneth Paltrow uses to shave off Johnny's moustache is the same one used in Sweeney Todd, which also starred Johnny Depp. Oddly enough, his wife's name in Mortdecai is named Johanna and his daughter's name in Sweeney Todd is Johanna
In a recent radio interview with Simon Mayo, Paul Bettany revealed that the teeth worn by Johnny Depp were a homage to legendary British actor Terry-Thomas.