What actors and actresses appeared in The Obsession of Billy Botski - 1980?

There seems to be a mistake in your question. There's no film titled "The Obsession of Billy Botski" released in 1980. It's possible you are remembering a film with a similar title or are mixing up the release date.

Could you please double-check the film title and release year? This will help me provide the correct information about the actors and actresses who appeared in the film.