Creator Backlash: Alan Moore has expressed distaste with the existence of the series (but then again, he's been pretty bitter about anything Watchmen-related that he wasn't involved in). Dave Gibbons, however, is more supportive, if not slightly ambivalent.
The Comedian appears in more titles than any other character. Rorschach and Curse of the Crimson Corsair are the only ones where he doesn't show up.
No character appears in all of the books.
Rorschach is the only one of the books to feature no one from the original Watchmen except for the titular character, and to not reference any plot elements of the original.
Several scenes appear in multiple titles. The most frequently seen of these is the Crimebusters meeting from the original series, which appears in Ozymandias, Nite-Owl, Silk Spectre and Dr. Manhattan.