Just re-watched Episode 1, I missed a bunch of stuff first time around

1. Chick staked on tree ends up being a zombie (white walker), didn't register at the time
2. Didn't realize Lady Stark's sister was married to John Aryn (sp?) and that's why she ends up at the badass secluded castle
3. Dany is alluded to as a dragon when she steps into the hot tub and doesn't feel a thing
4. TBH they never showed the youngest Stark boy the entire season, he is shown barely in ep. 1 and then all of a sudden he's in the crypt in the finale

Probably more