 While the episode appears to follow immediately from the previous episode " School Reunion " , Moffat says in the DVD audio commentary that when he wrote " Girl in the Fireplace " he had not yet read the end of " School Reunion " , hence the lack of Rose 's continuing animosity shown towards Mickey after he joins the TARDIS crew . After reading the Doctor 's mind , Reinette says " Doctor who ? " , a reference both to the series ' title and to the long @-@ running mystery about the Doctor 's actual name . She also says that it is " more than just a secret " , but does not elaborate further . Moffat said that he added the dialogue because he believes that because the Doctor does not tell even his closest companions his name , there must be a " dreadful secret " about it . Moffat also says that he did not include the word " Torchwood " ( an " arc word " in the second series ) in the script because Davies did not ask him to do so . 
