The Writer's Tale , Davies notes his disappointment at not being able to afford to create the version of the Shadow Proclamation he had in his head with all of the returning aliens.  Well he has now, by giving the Whoniverse its own alien-rich dvd freeze frame friendly Mos Eisley (expect a list of cameos on the wikipedia by the end of the night).  It was unlikely that the Doctor's convenient absence during Children of Earth and Jack's reaction thereof were hardly going to be explained in the mother series and on reflection it's ok that there wasn't animosity, cushioned presumably by the introduction to Alonso. More surprises.  A cute nod to Human Nature , proving once and for all that the Tenth Doctor does do families and the final meeting with Rose bookending the Doctor's story in a way we've not seen before and in a weird way would have been like Tegan turning up for Caves of Androzani .  But as with all of this, it suits the Russell T Davies era.  He apparently hummed and harred over how to bring Rose and her Mum back what with them being in the alternate universe but actually this was the perfect ending, which he suggested himself way back in the public transport and chips flashback that opened Doomsday . The final scene, the final line.  He's alone again.  Well, alone with the TARDIS.  I finally cried when he touched the controls of the console for a final time.  Having