the chapter called fearful symmetry is something else- the first panel is a mirror of the last, the second of the second last, all the way to the middle of the book, which is an action shot of adrian veidt.
also keep an eye out for clocks, various things in the shape of a smiley face with the streak of blood (which itself is a take on the clock), and all the little things written on random objects in each panel. the art has some serious depth to it, which just adds to moore's ridiculousness.
also, check this out:
http://www.capnwacky.com/rj/watchmen/chapter1.html this guide really opens up the book and helps you to catch all the little details that make it so special.
i hope you continue to find it interesting