real photographic image of a person's head (in this case David Hasselhoff) was superimposed over a cartoon body, a practice which would become common throughout the series. Parker said the technology was not previously available in the earliest episodes of the series. Comedy Central was required to pay royalties to the photographer of the picture used for Hasselhoff's head, but was not required to pay Hasselhoff himself. "Tom's Rhinoplasty" displayed noticeable differences in South Park's animation, which was gradually changing throughout the first season and settling into the defined look the series has maintained throughout the years. One of the exterior scenes in "Tom's Rhinoplasty" featured the first perspective angle of a street, which were previously only shown sideways or straight angles. Additionally, the simulated rain during a scene with Wendy watching Ms. Ellen and Stan from outside a restaurant was far more sophisticated than any such animation in previous episodes. Chef sings a song called "No Substitute" to Ms. Ellen in an attempt to woo her. The brief song was later expanded and included in Chef Aid: The South Park Album, a South Park soundtrack released in 1998. "No Substitute" was performed by Isaac Hayes and was written by Parker, Stone and Bruce Howell, a South Park composer and producer. During one montage scene in "Tom's Rhinoplasty", a jealous Wendy recalls memories of her relationship with Stan while a sad song plays in the background. The song is performed by actress Courtney Ford, who appeared as an extra in the 1998 comedy film BASEketball, which starred Parker and Stone. Like Henstridge, Parker asked Ford to appear in the episode because he found her attractive. The Indigo Girls-style song in "Tom's Rhinoplasty" was written and sung by Toddy Walters, who played protagonist Polly Pry in Trey Parker's 1996 film, Cannibal! The Musical. The song is called "I Love Domestic Chores", and was written "as sort of a lesbian anthem". During one scene, Wendy tells Stan that she smelled Ms. Ellen taking a "smelly dump" in the bathroom in an attempt to make him less attracted to her. In the original script, Wendy originally told Stan that she had a yeast infection, but Comedy Central censors made Parker and Stone change the line. Parker and Stone said although the network typically provides great leniency in permitting obscene jokes, they often object to lines about female hygiene problems. During a cafeteria scene,