"We've created a monster!"
zombies coming out of the grave and want humans to join them, one tombstone has the name Jacques Tourneur - the director of the zombie classic "I walked with a zombie"
June Cleaver and Beaver Cleaver mentioned
zombies coming out of the grave and one tombstone has the name G.A. Romero - the director of the zombie classic "Night of the Living Dead"
Soldiers come back from the war as zombies
a man comments on the zombies eating brains