I really hope there is going to be another season as this was a very moving and funny show. Very likeable characters and admittedly one of my best theme in a show which is "apocalyptic drama", but it was really taking to next level with the comedy and banter.
The flash backs helped me understand a lot how why the characters turned out the way they were and also shaped their character development, though i'm not exactly sure why something which looked like high school turned out to shape a lot of who the characters turned out to be.