I watched several episodes of CHEYENNE over the weekend, and I couldn't help noticing how so many of the younger actors on that show were giving "stage," rather than "screen" performances.
Then, there was an episode guest starring John Carradine. He could be so dynamic on screen, yet he knew how to underplay on camera for maximum effect.
I saw him do a couple of stage shows (i.e. THE WINSLOW BOY, SHADOW AND SUBSTANCE) at the Cirque Playhouse in Seattle during the late 1950s and also got to know him somewhat after I moved to Los Angeles.
He was really a magnificent performer. Aspiring performers should watch him to learn how it's done.