Other mistake: When Mr. Bavalaqua is telling Jerry and Duncan the rules for the big race, there is a male extra right behind him who is mouthing Bavalaqua's lines as he's talking. (00:21:00 - 00:22:00)
Other mistake: When George and Elaine are arguing about a bald woman rejecting him because he's bald, he says, "No one walks into a beauty parlour and says, 'Give me the Larry Fine.'" Larry Fine, who was partially bald like George, was a member of the Three Stooges. George should have said, "Give me the Curly Howard." He was another member of the troupe, and fully bald.
Suggested correction: This isn't a mistake; just because Curly was "more bald" than Larry, it doesn't make the joke wrong, or the statement an error. If anything, the fact that—as you point out—Larry's hair was more similar to George's makes it more appropriate that George references Larry rather than Curly.
