Ruby Gloom
Shout-Out in this series.- Ravens named Edgar, Allan and Poe. These names are partially justified when they are revealed to be descended from Paco the pet bird of Poe himself.
- Misery's family, a family of Anthropomorphic Personifications of abstract concepts that all begin with the same letter.
- Len had a both literal and figurative Shout-Out when he quoted Ringo Starr from The White Album: "I GOT BLISTERS ON MY FINGERS!!"
- Skull Boy gives a Shout-Out to Ringo when he auditions as a replacement for Scaredy on drums (when he [temporarily] gets stage fright), wearing a mop top wig and coming out with an exaggerated Scouse accent.
- The Sunlight Sphere is a reference to The Twilight Zone.
- The Layabout's Guide to the Universe in "Gloommates".
- In "Skull Boys Don't Cry": "First rule of Fright Club is 'We don't talk about Fright Club'."
- Shout-Out to Shakespeare: In "Ruby Cubed" not only are they making a play based on Romeo & Juliet, there are also references to other Shakespeare plays throughout the episode.
- In "Übergloom", Gunther says to Uta, "Look at these photos and tell me. Is it safe?"
- Migraine constantly parodies Titanic (1997) the way she screams "I'M QUEEN OF THE WORLD!"...and also she showed up ON the Titanic (and jinxed it).
- "Hair(less): The Musical" is a reference to the musical Hair.
