Geoffrey Maynard is a parody of original London and Broadway Les Miserables star, Colm Wilkinson. He sings a version of "Bring Him Home" and other refrains from Les Miserables, in the unique style of Colm, throughout the episode.
The alien-type creature at the end of Cartman's "inspiration" sequence is from the film Inseminoid(1981)
Cartman jokes an unfortunate accident would be like Geena Davis getting her own television show. She would go on to just that in 2000: The Geena Davis Show (2000) and in 2005: Commander in Chief (2005).