Such as? Because Ozymandias' plan made considerably less sense than it did in the book.
things about the Watchmen Movie that were better than the book
-the giant "psychic squid" thing getting turned into an acual bomb
-Dr Manhattan's diologue
-the idea of "nuclear war" getting mentioned verbally by one of the principal characters (Dr Manhattan) instead of us looking at people reading newspapers
-the extranious characters being edited out for a more streamlined, less confusing narrative
-the whole subplot of the "pirates" being edited out
-the scene of rorshach presenting his "mask killer theory" to Adrian Veit is changed to Dan Drieberg talking to Adrian which is done as a giant set-up for the scene at the end where Drieberg beats the shit out of Veit
-in the book, it appears as if Dan is fucking Laurie at the moment Rorshach dies, which actually bothered me before i even knew the movie was being made
in the movie, Nite Owl actually watches Manhattan vaporize Rorshach, Dan, realizing that Manhattan is "totally out to lunch" instantly blames Veit for Rorshach's death and runs in and beats the shit out of Veit, this, when combined with the scene of Dan telling Veit about Rorshach's mask-killer-theory, (instead of Rorshach doing it himself) makes Dan Drieberg a much more 3-D, and much more "human"/sympathetic character than he apears in the book
-in the book, after Rorshach escapes from prison, he returns to his apt to retrieve a "spare face", with a confrontation with his landlord, in the movie, Rorshach's "face" is in the psych doctor's office, and he retrieves his mask before he even sees Dan and Laurie, for me this was a much better-done scene, making Rorshach seem much scari-er than he apears in the comic