Of course, I saw the 2007 movie "I Am Legend" first but recently I picked up the book at a library book sale; just finished it last night. Here are all the similarities between the movie and the book:
There's a character named Robert Neville.
That's about it. When I was done, it was bizarre to think the movie was based on the book: the setting, themes, characters and story are only peripherally related. It would have been less jarring to read about the Joads heading out to California.