Oh, but I can. That is the support for the bench, which is seen straight on and thus forms a straight line.
Thanks for being observant. You're correct, of course - I went back and looked at the bench and where the supports are located. I needed to put down the coffee this morning and not pretend I know anything about photo forensics.
I don't like the video - the narrator says "Oh look, I found the original" (the one with just the g-parents). He never cites a source for that.