Found this nugget tucked into the review of Conan O’Brien’s first night as host of The Tonight Show:

In another change to conform with “Tonight” show tradition, Mr. Ferrell remained on the couch after his guest spot. On “Late Night” each guest departed after their segment.

That’s awesome. I always missed Johnny Carson’s long couch and all those celebrities sitting there after their official appearance ended. Often the funniest bits occurred when they piped in during another interview. Ah, good times.