The Watchmen graphic novel includes a number of things that the movie does not. One is literally a comic within the comic called, Tales of the Black Freighter. In Watchmen, there is a kid reading the comic throughout the story. The Tales of the Black Freighter story should be told concurrently with the story of the Watchmen, but that isn’t really an option now is it?
There is a Tales of the Black Freighter animated movie that will be on sale starting March 24. Here is a trailer for it:
Additionally, the DVD will feature the stories from Under the Hood. Under the Hood is the tell-all book written about the first generation of costumed heroes written by the elder Night-Owl, Hollis Mason. Segments of the book are included at the end of some of the chapters of the Watchmen graphic novel. I am not sure what they will do with Under the Hood in the movie, but I am really curious to see it.
You can expect a review in a couple of weeks.