In the original script, the character was described as a "green-haired, donkey-eared midget" as part of a running gag, where whenever Fozzie Bear began a joke describing someone, the person would appear from the crowd to object. In the final film, although Madden sports an eyepatch instead and has normal ears, his hair is still green. His dialogue is dropped, though, so he's glimpsed in the crowd and riding on a gangster's shoulders when the patrons rush out. He can be seen most prominently in the rooftop shot, holding an empty beer mug and sharing befuddlement and dismay over the lack of drinks on the house with the lumberjack and the sailor. Even with his reduced role, and despite being a working actor rather than a celebrity, The Muppet Show Fan Club News Vol. 1, No. 4 included Madden in the list of Hollywood stars appearing in the movie, between Carol Kane and Charles Durning.
Outside of The Muppet Movie, Madden was more active as a TV character actor, featured prominently in several series' episodes revolving around little person characters, such as The Incredible Hulk (as a midget wrestler who gets Banner into trouble).