I was watching a Seinfeld episode on tape today, and we noticed a blooper. It was the episode where Jerry and Elaine come up with the deal to mix there friendship with "that" (bedroom). It's her birthday and Jerry and her argue about his gift to her ($182). Kramer comes in and gives her the bench she really wanted. As Jerry and Kramer discuss the gifts, the camera switches back and forth between the two. If you notice Jerry's door in the background, it is open most of the scene, but for one quick take right in the middle of their conversation, it is closed. No one entered or left. Oops!