I personally think the final Seinfeld is the worst episode the show's ever had and a very lame way to end the series. Reflecting on what went wrong with this episode, I came up with a list of the mistakes made:
MISTAKE #1: Making The Final Episode > 1 Hour Long --------------------------------------------------- With the exception of "The Boyfriend", all 1 hour episodes have been rather weak and this episode, at 1+ hours was that much weaker. They just haven't been successful at sustaining comic situations for such a long length of time. When I heard the episode was going to be this long, the first thing in my mind was "uh-ohhh".
MISTAKE #2: Bringing Back Larry David To Write It -------------------------------------------------- Although Larry David co-created the show with Seinfeld, he has been off the show for 2 whole years and out-of-touch with the comic flow of the show for that time. This showed in the episode, which felt like one of
those reunion TV-movies that old sitcoms sometimes have which never have the same feeling as the original series.
MISTAKE #3: Taking The Characters Out Of NY --------------------------------------------- The final episode was actually pretty good until they left NY and it bottomed out from that point on. The characters seemed to be out of their element like fish out of water.
MISTAKE #4: Bring Back Too Many Characters ------------------------------------------- They tried to do way too much in the episode, bring back practically every character who's been in the show. A better approach, IMO, would have been to simply make a sequel to one of the popular episodes (eg. The Soup Nazi, Part II).
MISTAKE #5: Treating The Characters As Criminals ------------------------------------------------- The episode looked down upon the characters as reprehensible to society, which is far from the truth. If anything, we strongly identify
with them since they personify what everyone feels about a lot of the ridiculous social customs we all have to deal with.
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And that's my list. Overall, the final episode soured me a bit on the show, which isn't the way to go out for a show that wants to maintain its current success in syndication.