Now this is weird--for this ad promoting Season 6's "What's Up, Doc?", someone made the effort to dig up a picture of Beeson Carroll as Donald Penobscott (oh, excuse me, Lt. Col Donald Penobscott), even though he doesn't appear in the episode! Obviously the ad guy in charge felt the potential viewers needed a little more context to fully understand what they were going to watch.
Even stranger is, they chose Carroll as Penobscott, even though actor Mike Henry had played the Lt. Colonel more recently, in an episode from the very same season as this one.