let me break this down for you.
Omg dire wolves except for each one of the Starks live beyond the wall duh
what you wrote there ^ reads as 'Oh my god, dire wolves! except for each of the Starks live beyond the wall. duh'
which means, yay direwolves, but for some reason I need to mention that the starks (people) who I think live beyond the wall *(which is false, none of them live beyond the wall)
what you should have written, is "... except for each one of the starks' live beyond the wall" which would imply that the direwolves belonging to the starks live beyond the wall (but it would still be false, because none of the wolves live beyond the wall)
that apostrophe implies plural possession of the direwolves by the Starks, and by leaving it out, you sound like an idiot. and even by leaving it in, you sound like an idiot because by saying beyond the wall, you're supplying false information, as the phrase 'beyond the wall' in the series Song of Fire and Ice, means 'North of the Wall' and 'Not of the seven kingdoms of Westeros'. either way, you lose.