I've noticed that some actors and actresses have played multiple roles in Seinfeld, sometimes distanced apart by several seasons. Here are the ones I've noticed:
Suzanne Snyder first appeared in Seinfeld as the female Nazi, Eva, in the episode "The Limo", season 3. Later, she played the role of Audrey, the daughter of Poppy who refused the apple pie in the episode "The Pie", season 5.
Marty Rackham first appeared in Seinfeld as one of the two L.A. cops that chauffeured Jerry and George in "The Trip, Part II", season 4. Later, he played the recurring role of Jake Jarmell in "The Sniffing Accountant," "The Opposite", and "The Scofflaw."
I'm sure there are more people. Has anyone noticed other actresses/actors who have played 2 different people in Seinfeld?