"South Park" animators spent the first four episodes of the show trying to perfect the animation of the characters. By "Volcano" – which was produced after "Weight Gain 4000" –, Parker and Stone felt the textures were improved, as well as smaller details like the lines around the eyes of the characters. While the series pilot "Cartman Gets an Anal Probe" was animated with construction paper, subsequent episodes were made using computers. Nevertheless, Parker and Stone wanted the show to maintain its crude paper look; for example, they specifically asked for the night sky in this episode to look like a black piece of paper with holes cut into it for stars, just as it was in the pilot episode. Stone and Parker were especially proud of the animation of the lava, which they said took hours to perfect, although they acknowledged it ended up simply resembling orange construction paper. The lava ball shooting out of the volcano and almost killing Kenny was directly inspired by the "Volcano" film. Parker and Stone came up with the character of Scuzzlebutt during a random conversation with Comedy Central executive Debbie Liebling. While meeting with her, they simply started drawing the character, and decided to add a celery hand and Patrick Duffy leg for no particular reason. Scuzzlebutt also appeared in a second episode, "City on the Edge of Forever" from the second season. Scuzzlebutt turning out to be a real character rather than a ridiculous story was the first instance of a common characteristic of the Cartman character, in which Cartman says outrageous and completely unrealistic things that turn out to be true. Stone commented, "He's right more often than he's wrong."