I totally disagree. It first showed up as a face in one of the trees on the Abbey Road album cover in an RA video, but in fact it is not on that cover "in real life", because the photo on the album cover doesn't include that part of the picture that was used in the video. Also, I believe it is supposed to be John.
I'm sorry, but in the RA-associate video, it is on the right of the photo, in an area which is not included in the actual phonograph album cover of Abbey Road. I know, because I've looked for it there.
And it doesn't look anything like Paul to me, but it does bear some resemblance to John, imo. I don't mean to be argumentative, because I really don't very much care. But if it was intended to be a clue, it never made it onto the album cover.