This is what comes to mine:

Caan did to a lot a bit parts in films. I think his notable ones in The Rain People (FFC film), and Brain's song. I think he worked a lot with Duval in Roger Corman flicks.

Keaton had a bit part in 1970 movie Friends and Other Strangers and NBC's Night Gallery in which she played a nurse, she also did HAIR on broadway.

Pacino was more noted in off-broadway theather and he won an Obie for Does the tiger wears a Neck tie. He had a guess starring role in ABC's cop show NYPD and he met his old girlfriend Jill Clayburg during filming.

Duvall did some teleplays in the 50's, Roger Corman films, and of course MASH and Mockingbird.