Trivia... Each of the main characters has been called by another name by mistake, and so have two of the recurring characters. Can you give those mistaken names? Are there any other cases of mistaken identity?
(space added for spoilers)....
Jerry is called "Gary Seinfield" by the waitress in "The Bubble Boy".
George is called "Cartwright" by the maitre d' in "The Chinese Restaurant".
Elaine is called "Susie" in "The Susie".
Kramer is called "Kessler" by Jerry in the pilot "Good News, Bad News"; the mistake was explained in "The Betrayal".
Susan (George's fiance) was called "Lily" by Kramer in "The Invitations".
Newman is called "Norman" by the farmer's daughter in "The Bottle Deposit" (some may claim that Norman is in fact Newman's first name... the subject of many a thread in this newsgroup...)