The infected can't swim, but they do float. It is because of the high salt content in the ocean creates more buoyancy.
Nick figured out the walker guts camouflage in episode 2.03 "Ouroboros." In the Walking Dead universe Ouroboros comes before before The Walking Dead episode 1.02 ‘Guts. That means Nick figured out that trick before our Atlanta survivors.
Before the Apocalypse, Alicia overachieving was in direct opposite proportion to Nick’s screw ups.
Since before the apocalypse Chris has resented the Clarks and his dad’s new family. Chris has been trying to get his Dad to breakaway from the Clarks and focus solely on him.
Madison was a teacher before she was a guidance counselor.