This one gives me confidence that the movie will have the same tone of the book. However, some things are still confusing me. Why is Persephone in this movie? It takes place in summer, so she should not be in the Underworld. Yet there she is. Uma Thurman as Medusa looks disappointing considering she just looks like beautiful Uma Thurman with hairsnakes instead of a hideous Gorgon. So much can be done with makeup and computers that I don't understand why the filmmakers would choose not to use them to a greater extent.
Brandon T. Jackson seems like the perfect choice for Grover, who is one of my favorite characters in the series. Also, I can't wait to see Percy fight with all of that water!