While talking to his attorney in the cab, Kramer's face has returned to normal.
When Jerry puts the Rubik's Cube on the counter, the red and yellow sides are facing the camera. In the next shot, the white side is facing the camera. Also, the cordless phone next to the cube has moved a little further from the edge of the counter.
When George (Jason Alexander) is playing with the Rubik's cube while watching Jeopardy (2002), the cube is jumbled. A minute later, without George having worked on it, it has been solved.
Smoking isn't allowed in Monk's, but back in The Stock Tip (1990), George (Jason Alexander) smoked a cigar there.
There are numerous shots of the outside of Monk's Cafe, and one of the sign's "E"s is shown inconsistently lit or burned out.
The Portuguese waitress who has sex with George isn't actually Portuguese, she's Brazilian. She speaks Portuguese, but with a clear and recognizable accent.
Behind Jackie Chiles' desk are hundreds of law books. They are not in numerical order. In reality, lawyers keep their books in numerical order to make it easy to find a specific volume quickly.
It is established that George has gone this long without sex before, yet somehow, this time he becomes a genius. However, this apparent inconsistency was explained within the episode when Jerry commented, "So what? You've gone 6 weeks before." George then explains, "I can do 6 weeks standing on my head. I'm like a sexual camel. That's not the point. At least there was the possibility."
When George starts answering questions on Jeopardy! (1984) at Jerry's apartment, Jerry asks if it is a repeat. George starts to explain that he's been thinking a lot more clearly, then stops and answers a Jeopardy question during his explanation to Jerry. If listening closely to the TV in the background, Alex Trebek never gives another clue for George to stop and shout the answer "What is chicken Kiev?", but the contestant can be heard on TV giving George's correct answer.
George has abstained from sex for a lot longer, he said that, and yet all the other times he spent without sex he never got smarter.