Trivia

Reprised Chop Top, his character in Masacre en el infierno (1986), in a film that was never released called "All American Massacre (2000)," which featured music from Buckethead.

Has a band with Guns N' Roses guitar player Buckethead called "Cornbugs."

Was friends with Timothy Leary.

Got the part of Chop Top in Masacre en el infierno (1986) based on a cameo he did in a short film called The Texas Chainsaw Manicure.

Has been in six movies with Tom Towles (Regreso de los muertos vivientes 3 (1990), La casa de los 1000 cuerpos (2003), Home Sick (2007), Violencia diabólica (2005) Grindhouse (2007), and Halloween: El inicio (2007)).

Was once a journalist, writing for such magazines as Omni, National Lampoon and Psychology Today.

While many of his characters appear to be swamp people, Bill actually comes from an upper-class family with a strong connection to Yale University. He is the son of Virginia Gillette (Kleitz) and S. D. Moseley (Spencer Dumaresq Moseley). His mother was a journalist. His father was a captain and center of the 1942 Yale football team, a member of the Yale Corporation, and chairman and chief executive of the Railway Express Agency. Bill's paternal grandfather, George Moseley, was also a Yale football star. His maternal grandfather, William Lambert Kleitz, was a president and director of Guaranty Trust Co.

Father, with Lucinda Jenney, of actress Marion Moseley.

Was considered for the role of Captain James Deakins on La ley y el orden: Intento criminal (2001).