I found a great sketch in which Danny DeVito waits for the bus with Oscar and Bruno.
http://www.youtube.com/watch?v=dOzZoYlwdDo
Interestingly, it looks like Danny DeVito is wearing the same outfit he wore in Put Down the Duckie (I figure he would have), but something about his hair looks a bit different than in Put Down the Duckie.
Also, it looks like Oscar has some paper taped around his back. I wonder what that is for. Just about all other footage I have access to of Oscar and Bruno show either a front view of Oscar or a view of Oscar's left side, but in this one we see all angles of Oscar's body (except for the back, obviosuly). I wonder if maybe that paper could be part of a script (though it does look kind of small to be a script).
Finally, it looks like the image of Oscar and Bruno found in Bruno's page in the "on air" section of sesamestreet.org (as well as the menu for episode 796 in Old School Vol. 2) came from this sketch (or perhaps more accurately the taping of it).