The Apology - S9-E9
Audio problem: When Jerry is saying to Kramer "that was an hour ago", the beginning of the word "that" is cut off, and it sounds more like "at." (00:02:35)
The Apology - S9-E9
Continuity mistake: When Jerry and his naked girlfriend are playing scrabble just after Jerry accuses her of stealing and it flips to the front at the bottom of the screen you can see a bra or towel covering her breasts but is gone when she stands up. (00:03:40)
The Apology - S9-E9
Audio problem: As Kramer is saying "come on, Jerry, how about a baggy swimsuit", the audio does not line up with the timing of his lips moving. (00:06:30)
Chosen answer: George does mention his brother in the episode "The Parking Space". They actually really never mention anything that contradicts the fact he had a brother though, it just isn't mentioned.