第二季末尾伊莲不是和宋飞开始交往了吗，怎么后面几集像什么都没发生一样啊？剧情出bug了吗？

从一出场Elaine的身份就是Jerry的ex
中间有段两人想发展成friends with benefits
不留宿 不强迫第二天早上打电话 但是没成功
就回到了朋友的位置
有次Elaine穿着Jerry的衬衫还被Krammer撞见了
好像不是你说的第二季
好久没重温Seinfeld了
吧里好冷清都没人了

是这样的, larry在拍第二季的时候觉得宋飞正传的收视率不怎么样, 可能不会拍第三季了. 刚好大家也希望jerry和elaine一起. 于是larry就满足他们了. 然后又拍第三季了, 于是larry就完全忽略最后一集的剧情接着拍了.
ps 这集最后Elaine穿着Jerry的衬衫还被Krammer撞见了.

Jerry and Elaine had once dated, then had sex on some other episode, apparently a lot longer than the two date others in the series, and they usually mention that things didn't work out. There are subtle references to the fact that it was Jerry who ended it.
However, they slept together at least twice after breaking up:
In "The Deal", they create a set of rules whereby they can sleep together but remain only friends. Their theory is ruined, however, when they start squabbling too much (Elaine is furious when Jerry gives her $182 cash as a birthday gift). By the end of the episode the two decide to be a couple again, which lasts at least until "The Pen" where Jerry tells his parents that "we decided that we don't work out as a couple."
Later, in "The Mango", Jerry is so upset at learning that Elaine had faked her orgasms while they were together, that she agrees to give him another chance "to save the friendship". Despite this, Jerry and Elaine do prove that a former couple can still remain friends.

第九季 the serenity, Jerry向Elaine求婚，等她接手时，Jerry又收回求婚，George说这么些年我一直认为你们能复合，Elaine 说那是因为你是傻瓜。the finale，众人以为飞机会坠机，Elaine对Jerry 说 all these years i*ve always L...然后飞机安全着陆。最后Jerry再问起来她想说的是什么，Elaine说i*ve always loved United Airlines. 在Curb Your Enthusiam 中 Elaine向Jerry借精子有了个女儿，但是女儿叫Jerry Uncle. 已被虐死。

………

其实发展为男女朋友就没有意思了，还是这样好

好复杂的感情纠葛