I'm far more intrigued by all the apparent Rose references. A list compiled on another board:
Snowmen - She worked at the Rose & Crown
Snowmen - there's a rose on her grave
Asylum - She wears a Rose in her hair
Bells - Doctor puts roses by her bed
Rings - The date on Clara's mother's grave (3/5/2005) is the day Rose meets #9.
Cold War - Hungry Like The Wolf
Rose is coming back for the 50th, so I wonder.