- Acting for Two: Rod and Princeton are played, or at least always voiced, by the same actor. Same goes for Trekkie Monster and Nicky, and Kate and Lucy the Slut, and every show has one very busy supporting puppeteer.
- Approval of God: Jane Henson (Jim's widow), Cheryl Henson (his daughter), and Frank Oz all saw the show during it's original run and loved it.
- Cut Song: "Tear It Up and Throw It Away," which was cut late in the off-Broadway rehearsals. Kate gets a jury duty summons, but Nicky tells her to... tear it up and throw it away. As a sort of Mythology Gag, the tune of the song is used during Brian and Christmas Eve's dialogue during "The Money Song."
- Other cut songs include "My Life is in Boxes," "How Much Do the People in Your Neighborhood Make?" (a direct spoof of the Sesame Street song "People in Your Neighborhood") and "Take Your Time," which wound up being produced as an intermission video for the London production.
- They sell Bad Idea Bear finger puppets and Trekkie Monster hand puppets in the Avenue Q store.
- When the State of New York legalized same sex marriage, Rod and Ricky were married in real life, which kind of counts.
- Mythology Gag: The title, Avenue Q, is likely a reference to 123 Avenue B, which was a Working Title for Sesame Street, which the show was inspired by.
- Parody Assistance: Many of the puppeteers in the original production were played by veterans of Jim Henson shows.
- Talking to Himself: Several of the puppet characters, most notably Lucy and Kate.
- Trope Namer: For The Internet Is for Porn
- What Could Have Been:
- Gary Coleman was allegedly offered the part of, well, Gary Coleman, but never showed up for the meeting that would have sealed this.
- The original idea was more directly inspired by Sesame Street—a televised series of songs and skits teaching "lessons" about everyday life for twentysomethings, to be shown on [adult swim] or some such. The musical we have is great, but a TV series would've been something else again.
- Trekkie Monster was originally meant to be, well, a Trekkie, deliberately designed to resemble Cookie Monster.
Trivia / Avenue Q