By Alan Zilberman, Special to The Washington Post Best known as the brooding protagonist of the dramatic series “Mad Men,” Jon Hamm is also a gifted comic actor. In appearances on such shows as “30 Rock” and “Saturday Night Live,” the actor has mocked his good looks, keeping up with the shows’ more seasoned comedians. Hamm first hinted at this potential in the web series “Between Two Ferns,” in which interviewer Zach Galifianakis pretends to have contempt for his guest.