I love observations like this! Isn't there a woman in a brown dress who walks by multiple times outside the studio in "Requiem for a Falling Star"?
I used to have dreams like this that shook me up. I would realize I was in a dream only when I left a room only to find that the same people were in the next room, too.
I wasn't aware of the one in "Exercise in Fatality." I will have to go looking for it. Thank you!
It's been mentioned before, but in Dagger of the Mind, there's an actress who shows up in two different settings. In fact, she's a pretty popular extra in early ' 70s TV.