Among the odd things that appear on the hospital bills during Dethklok's performance are: Brain Removal, Renal Failure Clean-up , Blood-filled Lung Bandaging, Kidney Removal, Theatre Charges, Implant Costs, Sugar Serum Drip, and Boil Lancing.
During the scene immediately following the bloodletting scene, the band members each have a coffee mug of their own likeness, except for Toki, who has a "Skwisgaar" mug.
The Metal-Masked Assassin is wearing an arm brace due to the injury he suffered at Ofdensen's hands in the season one finale, "The Metalocalypse Has Begun".
This episode marks the third appearance of Edgar Jomfru, and the second appearance of The Teenager, who is wearing the face of Edgar's brother, Eric. They team up with the Metal Masked Assassin to form the group known as The Revengencers.
Doctor: You're not dying. It's just a cold.
Nathan Explosion: Indeed, we are dying. I really don't feel great.
Doctor: Did you ever have colds before?
Toki Wartooth: Can't you gives us injections?
William Murderface:Come on, use your fancy degrees,***hole!
Doctor: Take it easy, all right? No drinking, no partying.
(Pickles lights a cigarette and the Doctor takes it away from him) Give me that cigar.
Pickles:Just take it easy.
Doctor: Go to the sauna, sweat it out, and relax, okay? Take it easy. Idiots.
This episode is also known as Sicklok.
George "Corpsegrinder" Fisher, lead singer of band Cannibal Corpse returns to voice the Metal Masked Assassin.
Rob Dukes, Gary Holt, Lee Altus, Jack Gibson and Tom Hunting, the current members of the band Exodus voice various characters in this episode.
In this episode, the band play a song called "Pull the Plug". "Pull the Plug is one of Death's songs.
In this episode, the remaining Jomfru brother places the face of his dead brother over the face of the other prisoner. This is a reference to Slayer's song "Dead Skin Mask".
The hospital the band attend is called Necrophagist Hospital, named after technical death metal band Necrophagist
V for Vendetta:
While the band are playing with leeches, Nathan places two leeches on his upper lip, making a mock-moustache. He says he is the masked character from a movie starring Natalie Portman, the movie he is referring to is V for Vendetta.