Seinfeld rolled up to 1600 Pennsylvania Avenue in a silvery blue 1963 Corvette Stingray (which, even for those of who know fuck-all about this cars, is pretty, pretty sweet). They then hung out for a little bit in the Presidential Cadillac (no idea if that's what it's actually called), which has heated seats and a phone that can deploy nuclear submarines.
Finally, they have some coffee, in a White House cafeteria where they talked at length about Obama's underwear (one brand only, but he didn't disclose which one). Also, Obama typically only wears blue or gray suits, though he owns one black suit. The more you know!
Watch the full episode here.