We are returning to the continuity here, without a break, to view the aftermath of Pogo's journey, an epilogue of sorts. Maybe you've noticed that Kelly's satire is at its best when it takes on paranoia, secrecy and suspicion, which these two guys are always wallowing in. And this is even before Nixon!
As you can tell from the strip format, we have returned to the newspaper strips. Most of the strips to come in this post-Pandemonia epilogue were not in the book (though there will be a few from the book yet to come).