Ah, the seventies.
When a performer like Sammy Davis, Jr. could appear on television - smoking like a chimney - to belt out the theme from a then-popular (now forgotten) sitcom. Sammy even makes up a few lyrics to pad things out ("The man thinks you're trying to bust up all his dreams...?")
To emphasize that this is the type of performance you just don't see on television anymore - Sammy does some stereotypical "Mexican" humor at the end.