Unexpected Javascript: That Doesn't Do What You Think

First, it's very thorough and I appreciate your effort on this, good compilation of things I've seen before and many new ones.

As for feedback

  - contrast is hard to read. see http://contrastrebellion.com
  - NaN not being equal to itself is not unique to JavaScript (also in Java)
  - I'd group the foot notes with the context, my head spins :)

Again, this is just because you wanted feedback, but still I really like it, and thanks for posting

You've got your examples labeled by number per group and your explanations labeled by number for the total. This makes it a chore to look up an explanation.