30 Rock is the only show that I can recall doing much of anything with Leap Day. And I only recall that because I’d been watching older episodes during the down-time between fall and winter season on television. Here’s one way the show “did right” by the day: a “Leap Day Carol” about Jack and his daughter:
And then there’s the story of Leap Day Williams himself, a gag played throughout an episode by Jim Carrey. All wonderfully absurd (with a bit of Peter Jackson’s Bilbo Baggins at the end).