Who is this hiding... in Zapruder?

[Jake Maxwell]

This is one of four frames in an HD version of Zapruder that appears to be someone peering over the wall.

[Steve Howsley]

This is one of four frames in an HD version of Zapruder that appears to be someone peering over the wall.

I've looked pretty closely and I can't see anyone peeing over the wall. The blotchy stuff within the green circle is at best (if it had to be a living thing but not plant matter) the head of a cat. If it was a little more symmetrical it might qualify as a Rorschach Test image.

[Andrew Mason]

This is one of four frames in an HD version of Zapruder that appears to be someone peering over the wall.

You do realize that you are looking at two separate exposures superimposed.  You are seeing the bottom of the previous frame superimposed over the top portion of this frame. So the phantom people are standing on the north side of Elm.