The episode that really got me hooked was the one where the four of them were walking through a parking garage, looking for their car. Kramer was lugging a tv and Elaine had a gold fish.

In the final scene they finally get to the car (sans goldfish), and the car won't start. Years later I learned that the scene was designed for them to drive away, but the car engine unexpectedly failed to turn over. You can actually see some of the actors laughing in the car when the car fails to start.