During his college years, Bill Walton played for the University of California, Los Angeles (UCLA) from 1971 to 1974. In 1974, Walton began his professional career in the National Basketball Association (NBA) and was drafted by the Portland Trail Blazers. He played for them until 1979. He changed teams and played for San Diego Clippers until 1985. In 1985, he moved to the Boston Celtics team. He played until 1987, when he was injured. He tried to return in February 1990 but his injuries intervened and he retired as a player. Since 1990, he has been active as a television sportscaster.
At the time of filming Ghostbusters, Bill Walton played for the San Diego Clippers. Walton appeared among part of the crowd outside the Shandor Building near the Ecto-1 as the end credits began playing.