The girl in the park who thinks Kermit is a bear is Christine Nelson
, daughter of Muppeteer Jerry Nelson
(with whom she appears in the scene). Christine suffered from cystic fibrosis throughout her short life, and finally succumbed to the disease in 1982, one year after the film debuted. See more
[banging on bathroom door
Hey! What's goin' on in there? Lotta folks out here need to use the restroom!
Well, we're developing these pictures, we'll be out as soon as we finish. We're trying to catch a jewel thief.
A jewel thief!
Well, catch him in another room, people are dancing up and down on one leg out here!