Of course, Bob himself didn't think the Larry Black sketch came off that well, if the Season One commentary is to believed, right?
I was never all that crazy about the "Third Wheel" sketch (probably worked better on stage), and the writers' conversation that followed it was just DEADLY. In fact, I'd say that the episode those bits came from ("We Regret To Inform You") is the weakest MR. SHOW overall (the Borden Grote sketch was too long, most of the other sketches had dead patches, and only "Screwballz" is worthy of mention in the same room as the classic MS pantheon). That said, there are very, very few MR. SHOW bits that come off as egregiously ill-conceived - things were threatening to possibly tip over into blandness at times during the last season, but they somehow always managed to pull it up out of the fire. If they stayed on the air past Season 4, who knows if they could have kept it up? Python's truly great episodes dried up not long after their thirtieth show, after all...