I remember it having been an even smaller ad than that, but yes, those were the images on it. I think it was edited so you just saw Nancy's face, not the stake (possibly due to how graphic the image is--it was somewhere in the Deep South, for sure, and in 1970 there were more stringent rules about what could be shown in various places, as you recall...).
If you own the hoDS pressbook--which I have never seen--I would think the ad would have been in there.
Best, G.