I still can't get the Station Wagon (Ending of Episode 2) stocked by supplies from my head...
I mean, it really resembles to "Organ Trail" by Man who wear many hats. I mean - it's Station Wagon stocked with food and stuff, in the middle of nowhere, without gas and abondoned... So, I guess it is either coincidence that TTG chose Station Wagon and filled it up with supplies or an easter egg
EP4 - Also, it's more of reference - "For whom the bell tolls" cited by Chuck (I know it's from Hemingway, but it is also name of Metallica's song and originally it is a poem from John Donne... so there's that)
Also the mercy kill Lee does with the attic zombie kid awfully reminds me how Rick killed Helen in Pilot/Comicbook; but I see this more of a slight reference than actual easter egg