Graffitti on the back of the van in the gravediggers segment says 'Netherrealm' - a dark realm of the dead in Mortal Kombat.
Bobblehead in the gravedigger's van - Raiden, god of thunder who moves between realms and sacrifices his own immortality to protect the world of the living.
The brain shot in the dream segment was made out of a kombucha mother.
The dead man's wife is Mara, which means "bitter" in Hebrew.