Who Was In Both 30 Rock and Parks and Recreation?

Jon Hamm was in both 30 Rock and Parks and Recreation. Obviously this means that after Dr. Drew’s bubble burst and he was disbarred as a doctor (or whatever doctors get, disboarded?), he went to work for Leslie Knope in Parks and Recreation S6E20 since he had heard through the Incompetence Interconnection Interface that she would not fire anyone for incompetence, not even the legendary Gerry Gergich (the III, pronounced iii, provides a network through which incompetent workers can share their successes).