In the scene in Dora's (Matreya Scarrwener) bedroom, you can see a Once Upon A Time show poster. Matreya Scarrwener played Dorothy Gale in an episode on Once Upon A Time.
Jenna Elfman also did an episode of "Dharma and Greg" wherein she didn't get to go to prom as a child, so she found a way to go as an adult.