
It’s tough enough for TV writers to make viewers laugh for 22 minutes — to extend an episode’s length to 44 minutes, even spread over two weeks, that’s just downright crazy. But every so often, a sitcom plot will be spread over two episodes (with the occasional “To Be Continued” thrown in for good measure), oftentimes with mixed results. Below we choose twelve of the best two-part episodes, some season-ending cliffhangers, some series finales, and some that work as a two-part story arc. And don't worry: some Simpsons, too.

171. "The Bookstore"
170. "The Puerto Rican Day"
169. "The Reverse Peephole"
168. "The Dealership"
167. "The Burning"
166. "The Frogger"
165. "The Strike"
164. "The Cartoon"

The cast of Seinfeld was a well-oiled machine and still stands as one of TV's all-time great ensembles, so it's no surprise that it took a lot of playing around with different casting possibilities before Larry David and Jerry Seinfeld found their George, Elaine, and Kramer. The cast wasn't even complete by the time the pilot made it to air with Julia Louis-Dreyfus nowhere to be found until the second episode and another actress playing a coffee shop waitress named Claire who was intended to be the fourth member of the gang.
Seinfeld's was an amazing, perfectly-balanced cast, and if any of the four leads were switched out, it [...]

This is adorable: "Jerry Stiller, who played George Costanza's irascible dad on Seinfeld, made a surprise visit last week to the couple who live in the Astoria, Queens, house that doubled as the Costanza abode. He made their day."