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The Airport - S4-E12

Deliberate mistake: In this episode Elaine angers the bag man and he puts her bag on a plane to Honolulu. When Jerry and Elaine arrive in New York and are waiting for their bags, it cuts to the "Hawaii" airport and shows Elaine's bag coming out to the baggage claim belt. This was a deliberate mistake as there is no way Elaine's bag could have gotten to Hawaii at the same time Jerry and Elaine are waiting for their bags in New York, since they only left from Missouri.

The Kicker - S6-E11

Revealing mistake: During the scene after Robert breaks the window with the football, if you look close at the broken window, you can tell that it is some sort of thin material and not glass. Around the break the "glass" is flapping in the breeze like paper. (00:12:20)

The Angry Family - S6-E1

Trivia: During the opening scene in the classroom while the children are reading their stories if you look to the left of Ray on the screen you can see his real life wife Anna Romano standing next to him acting as a parent for another child in the class.