This also applies to general answer choices that work as a group to mess with us, for instance, making the correct answer seem wrong by proxy or contrast. Also, by general test-making strategies you've noticed that have pulled a fast one on you. LSAC, you clever devil.
I'll start:
Logic Reasoning: (flaw) when every answer (except the correct one) mentions the data, and the real answer is about the method being flawed. I always see it as out of scope and want to cry afterwards.
Logic Games: the words "at least" in the rules. 1-4 questions not mentioning or needing for you to utilize that bit of knowledge, and your subsequent forgetting about it until the last problem in the set mentions it. Cut to - rechecking every answer to make sure and general panic.

Reading Comprehension: Let me spend 3-4 paragraphs explaining (with no hint of bias) how a certain theory based on years (decades, centuries) of studies is supported by everyone. Then here are a few sentences towards the end why we shouldn't really buy into it, or reconsider our views, or simply not believe it. Oh! First question is Main Point, good luck with that.

I have found myself laughing at times when I get certain questions wrong, and I hope that a bit of humility and sharing of angst might allow us to catch these issues before they, well, become issues.
I also feel that if by the end of my LSAT studies I'm not able to teach a class on Mexican/African American Literature, the dangers of cholestoral, or how to effectively arrange arbitrary objects on a shelf, I've done a disservice to the test.