He wrote the story or book the work was based on in most cases, actual
screenplays for Time and Timbuktu and Wanda June, and the film you mention, he
plays himself as an actor. He didnt' write any of the script, but Harold Ramis
was involved
http://us.imdb.com/Name?Vonnegut+Jr.,+Kurt
Breakfast of Champions (1999) (book)
Mother Night (1996) (novel) (as Kurt Vonnegut)
Harrison Bergeron (1995) (TV) (story)
.... aka Kurt Vonnegut's Harrison Bergeron (1995) (TV)
Welcome to the Monkey House (1991) (TV) (book)
.... aka Kurt Vonnegut's 'Welcome to the Monkey House' (1991) (TV)
Displaced Person (1985) (TV) (novel)
.... aka D.P. (1985) (TV) (USA: video title)
Slapstick (Of Another Kind) (1982) (novel)
.... aka Slapstick (1982)
Who Am I This Time? (1982) (TV) (story)
Next Door (1975) (story)
Rex Harrison Presents Stories of Love (1974) (TV) (story Epicac)
.... aka Short Stories of Love (1974) (TV)
.... aka Short Story (1974) (TV)
.... aka Three Faces of Love (1974) (TV)
Between Time and Timbuktu (1972) (TV)
.... aka Between Time and Timbuktu: A Space Fantasy (1972) (TV)
Slaughterhouse-Five (1972) (novel Slaughterhouse-Five Or The Children's
Crusade)
Happy Birthday, Wanda June (1971) (also play)
"Bus Stop" (1961) TV Series (story) (episode "Runaways, The")