There's some outstanding bits, then there's stuff like Jaime in his armour sinking to the bottom of a lake in an end scene and then the very first scene of the next EP he's a long way from where he entered the water and has apparently managed to simply swm away from all the fighting and Dothraki...
Given people being dead and then turning up alive in the show is common enough having a guy who we never see die then actually be alive isn't much of a stretch.
I'm thinking that Meera (and Jojen) role with Bran goes deeper than the warg side of things and will open up into the Reeds coming into play at some stage now Howland Reed's history with Ned has been exposed to viewers.
Obviously Howland is aware and watching as things unfold as he sent his own...
I'm going to go with some out there predictions as i've not read the books (no spoilers!).
Melisandre brings you know who back to life.
Brianne doesn't kill you know who.