How do I remove an identical background / common element from a series of layers/images.

Hello and good day,
I have found dozens of articles on how to remove the uncommon items from a series of near identical photos, for instance removing tourists from a series of shots using Scripts -> Statistics...
What I am trying to do is the exact opposite of this.
I would like to compare a series of frames, and remove all common elements from them; leaving only differences.  I figured I would be able to use the statistics script to get the common background, then somehow compare it to each frame and remove the common background.  Basically doing a reverse green screen when I am removing the background instead of adding it.
I have Adobe Master Collection CS6.
Regards,
Jeffrey Taylor

That sounds like something AstroPhotographers might use.  We have an expert here, but I believe he is kind of busy right now, but he might happen along.
Otherwise, I don't know how to do a reverse Median effect.  You can do it with two layers by aligning and setting the top layer blend mode to Difference, but identical features go black.  You'd have to make a luminosity mask from that frame and apply it to a layer mask to leave the people after returning the layer mode to normal.    But I can't think how to do it with a lot of frames together.

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