There are a lot of similarities and differences in the book and movie Percy Jackson the Lightning Thief.First of all, a similarity that is both in the book and movies Percy fights Medusa. Obviously, they are similar because in the movie and in the book they both go to the Gnome Emporium and fight Medusa and in both Percy cuts Medusa's head off.Second of all, a difference is that Percy was told the he was Poseidon son in the movie and in the book the Percy found out he was Poseidon's son by fighting Clarissa and using the water to help him win. Therefore this is different because also in the movie he didn't fight clarissa he fought annabeth. Last of all, a similarity is that they both went into the underworld. This is similar because in the