I n my opinion, Joanna Pettet wasn't particularly well-used by either television or films following her Night Gallery years.
Always the girlfriend or fantasy object.
It's like the Manson Family.
Actresses like Mia Farrow, Joanna Shimkus, Ali MacGraw, Senta Berger, Elke Sommer, Julie Christie, Jane Birkin, Raquel Welch had their careers go into decline.
Funny that you mention how Pettet never seemed to smile.
When he flees his apartment in terror, he runs to Stanley's who calmly locks the door and listens to him scream.