As for the crack, it seems to me like two more episodes is not enough to address that and all the issues it brings. I'm betting it will be addressed on Smith's final season (and we'll probably see Rory sometime before that). The DIY Tardis seems like it could use a reappearance as well.


Also, do they grow old while time travelling? It would seem weird if it takes them a long time to solve the crack thingie and bring Amy back for her wedding a few years older.