It's depends on the show's concept. Particularly the talk shows that u said are in family hour. And that kinda talk shows in s.Korea tend to show comfy atmosphere with that kinda stuff, pillow/blanket, etc.
Many other Korean talk shows don't have that stuff. Like 썰전, 마녀사냥, 라디오스타, 속사정쌀롱, 비정상회담, etc