Yes, I think you're right.
I have another doubt... :-
I don't know if the grave scene is an homage to zombies movies in general or if it's a reference to a specific movie...
If yes, wich one?? ???
I saw Romero's Night of the Living Dead, Dawn of the Dead, Day of the Dead and Fulci's Paura nella cittÃƒÂ dei morti viventi ( City of the Living Dead ), Zombi 2 and Zombi 3, but I didn't notice a similar scene... ::)