The recurring theme of "Ride of the Valkyries" whenever Jenna is about to deliver a verbal smackdown.
From the musical, "She Used To Be Mine", and "Club Knocked Up" could be seen as this.
Diagnosed by the Audience: Dawn seems to have some severe social anxiety, as explained in "When He Sees Me", and shows some characteristics of having Aspergers Syndrome.
Harsher in Hindsight: Dawn's fear that her blind date might be a serial killer may serve as this after Adrienne Shelly's real-life murder.
The actress who plays Nathan Fillion's wife in the film shows up as his ex-wife on Castle.
Also, Jenna's usual OBGYN is named Dr. Muller, which is the same last name of actress, Jessie Mueller who originated the role of Jenna on Broadway.
Moral Event Horizon: Earl slapping Jenna across the face takes an already irredeemable character and makes him beyond irredeemable. Audiences gasped at this moment when the film played in theaters.
Unintentionally Unsympathetic: Ogie refusing to take "no" as an answer while pursuing Dawn is meant to force Dawn to get over her insecurities and give him a chance, as they do ultimately have the happiest relationship in the story after getting to know each other. However, without knowing where their story is going, Ogie's introduction makes him look like a creepy stalker who insists he and Dawn belong together even though she's quite uncomfortable, assuming that her pushing him away is just playing "hard to get." This is softened slightly in the musical, since Dawn and Ogie are shown having a mutual attraction from their first introduction, but the stalking aspect remains.
What Do You Mean, It's Not for Little Girls?: There are a lot of little girls who love the musical, despite it having cursing, sexual scenes, and adult themes that would go over a kid's head. An early example of this would be the song "The Negative", which is centered around the results of Jenna's pregnancy test.
