I met both William Schallert and Dwayne Hickman in LA about five years ago. In person, you can see they've both had their share of skin "enhancement." Dwayne had a very poor hair dye job, the classic shoe polish look. Both were very nice guys and loved talking about the show.
I've very envious.
Schallert has touched on more of the mid level popular culture than most any other character actor in my lifetime. Hickman has apparently had a very successful career as a "suit" in TV production for 40 years. Both would be amazing to talk to. I would have particularly liked to talk to Schallert about Collossus and Hickman about what I consider the greatest western comedy ever (take that Mel Brooks), the Academy Award winning (best actor) Cat Ballou. I bet both would have had fun stories.