A personal favorite for me is Henry Winkler, just recently given co-star status on Happy Days in the third season, and speculating about where his career could go. People have talked about how Winkler seems so gentle and thoughtful in interviews for later years, but he's definitely like that here: Humble, realizing his luck, worried about typecasting, respecting his temporary status on the "throne", and being ready for the next stage of life when it comes.
https://archive.org/details/Henry_Winkler_Interview_by_Bob_Lardine