The life support systems strewn about Dethklok's lair keeping the chef alive are a reference to the album cover for "Killing Technology" by the band Voivod.
When the band members are recalling the deaths of their other chefs to their new chef, it is mentioned that one of their chefs became depressed and blew his brains out, to which Toki remarks that it made a great album cover. This is a reference to the notorious Norwegian black metal band, Mayhem, whose former singer, Dead, blew his brains out with a shotgun. Mayhem later used polaroids taken of the aftermath of his suicide for an album cover.
At the supermarket, frontman Nathan Explosion takes over the intercom and references the songs, "Every Bone Broken", "Rotted Body Landslide", and "Hammer Smashed Face", by the popular death metal band Cannibal Corpse.
The name of the grocery store, "Fintrolls", is a reference to the Finnish metal band Finntroll.