This discussion may contain spoilers!
Of course I didn't think this at first but I saw a video that said they had evidence so I looked a little closer. At the starting when it shows the truck stop before the zombie outbreak you see a blue truck and a man. (I also think you see a little boy running towards the truck) then in the walking dead season one Kenny is wearing the same clothes as the man and it's the same truck. So is Kenny in 400 days?