I certainly remember the Ed Sullivan show and watched it many times. I remember seeing Stiller and Meara, but can't say necessarily it was on is show. I also remember Topo Gigio.
And of course Senor Wences.
I liked Stiller best as George's father, better than the two actors who played Jerry's. Not a bad life, a decades-long career with a resurgence in his "senior" years. A loving wife and a successful son and dying at 92. We should all be so lucky.