These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Big Lipped Alligator Moment / The Stinger: During editing, Bousman realized there was no place to actually fit in the song "In All My Dreams I Drown" that would make sense... so they put its scene in the credits, since the song was too good to cut.
Ear Worm: To be expected. "In All My Dreams I Drown" is proving to be popular already.
"Fa la la..."
"You're a tough little tadpole to love..."
The currently unnamed Translator's Song from The Devil's Carnival Part 2 has the honor of being an ear worm before the movie has even been filmed, thanks to Terrance Zdunich and Saar Hendleman's performance during the Repo/TDC tour.
Evil Is Sexy: Terrance Zdunich's portrayal of Lucifer in the song "In All My Dreams I Drown".
The Scorpion also seems to serve this purpose. And how.
Ship Tease: Various times, between various couples, particulary Wick and the Magician, who spend an awful lot of time hanging off each other (which is Hilarious in Hindsight considering that their characters in Repo! (Luigi and Shilo) were quite the popular ship themselves)...
Bill Moseley and Alexa Vega are pretty chummy◊ backstage as well.
They Wasted A Perfectly Good Actor: Two of the Woe-Maidens are Captain Maggots and Contessa, both of whom have actually spent time as part of a circus. When you have a woman who slings flaming hula-hoops around herself and another who specialises in aerial silks, and your movie is circus-themed, you really should find a way to put that in!
There's actually a brief shot◊ of Maggots and her hula hoop in the beginning, but that's about it.
What an Idiot: Tamara? You're supposed to ask him how you know he won't stab you before he's got you tied to the wheel!
Miss Merrywood. Woman practically personifies Too Dumb to Live! She replies to a sign saying "Take only what you need" with a smirking "I need it all! Ahahaha!" and steals all the jewels... and then ogles her appearance in a mirror (conveniently missing the "Do Not Trust This Person" sign that points at the mirror)!
Justified for both Merrywood and Tamara. Tamara was in Hell because her 'sin' was gullibility. And Merrywood's sin was greed.