At the very end of the credits, after the final logo, you see the girls in their lab. Patty has on a headset and is listening to an audio tape, repeating one section several times. Erin asks if she has something. Patty answers, "What's Zuul?"
"This is a work of fiction. The characters, incidents and locations portrayed and the names herein are fictitious, and any similarity to or identification with the location, name, character or history of any person, product or entity is entirely coincidental and unintentional."