The Chief’s first name was eventually revealed in Get Smart. It was Thaddeus. Someone (Max, I believe) pressures him into revealing it, and he gives in. The response is something like “Wow, no wonder you keep it secret.”
On All in the Family, two characters would often get stuck going through a door together. Also, there’s Edith’s line “Oooh [looking puzzled]. Oooh [dawn breaks over Marblehead]. Ooooh [shocked].”
That’s right! I’d forgotten that completely…
There was an episode on a few days ago, in which they show Karen on the phone in the bath. The camera’s facing her, so you can see her head and Stan’s feet. You hear her talking to him, but you never see or hear the man himself…