Corrected entry: When Kramer picks up The Maestro's baton and starts to shoot, he calls "6 in the corner." He knocks in a solid black ball, obviously the 8. (00:16:30)
The Hot Tub - S7-E5
Corrected entry: Towards the end of The Race when they spot Jean-Paul in the lead, if you look over to the right of the road you can see a vehicle with a man filming the scene with a camera.
Correction: This isn't so unusual; a race like that would attract at least the local news, who would want to film the winner.
Corrected entry: This mistake is in the episode where George and Susan pick out invitations for their wedding. Elaine comes into Jerry's apartment and says (to George) the wedding is only a month away. Earlier in the day George and Susan pick out their wedding invitations. Who sends out wedding invitations only a month before the wedding?
Correction: Apparently, they do.
Correction: This could be considered a character mistake.