Dang, was that a great episode. The end skit wasn't that good, but the Smothers doing a couple of classic bits was hilarious. I'm guessing they had good appearances on other shows, as well, but Jack really seemed to appreciate their humor, realized that he had a couple of really funny guys on his show, and pretty much just went with the flow (which was something Benny was known for). To Benny, the laughs were what counted, and it didn't matter if it was him or someone else who got them.
I wonder how much this appearance helped in the Smothers getting their own show, or if that came later.