- At 2:40, when Moxxie shoots the child, he uses a double barreled gun. In the next second, he has a scoped rifle.
- At 3:57 in the pilot, Loona's eyes have their colouration reversed, going from red sclera and white irises to white sclera and red irises.
- He Also Did: Several animators who worked on Helluva Boss also worked on Villainous.
- Name's the Same: Loona shares her name with a K-Pop Girl Group named LOONA and a Dutch pop singer named Loona.
- Playing Against Type:
- Richard Steven Horvitz is known for playing over-the-top buffoons like Zim and Billy. Here, his character Moxxie is the reasonable one, though he can get almost as loud if sufficiently roused up.
- Parry Gripp is primarily known for composing seriously catchy childrens' music and novelty songs. The songs he composed for the pilot, the "I.M.P. Jingle" and "Oh Millie" are, while just as cheerful and upbeat as his usual work in melody, a commercial jingle for an assassin business and a love song about an assassin's killing skills respectively.
- Talking to Himself:
Trivia / Helluva Boss