We used to call doing whatever was necessary to amuse the audience: "Doing the show." Laurie always does the show. When necessary, it means eating the scenery. Things are going well when the residue of your prior efforts allow you to sort of coast like a duck on a pond, but real showmen are always ready to break into the "seltzer bottle down the pants" when all else fails.
I have no idea what the recycled Marcus Welby MD show is like, but I imagine there's some "show" in it somewhere. The guy sheds it.