Percy Jackson was written by Rick Riordan.
The little pearls that they need to stomp on to get out of Hade’s safely. In the book they get them towards the end of their quest. In the movie they are part of the actual quest and they start out by going places to find them.
Medusa’s death. In the book Percy ships it to the Olympians. In the movie it goes along with them and actually helps them in their quest.
The Lotus Casino: I loved the eating of the Lotus Cookie (was it a cookie?) and causing a drug like state that would not let them leave... in the book I am not really sure what it was that drugged them. The air?
The ending with Luke – in the book Percy is bitten by a scorpion, but in the movie that’s not how it goes at all.
In the book, Annabeth has curly blonde hair and gray eyes, but in the movie, Annabeth has iron-straight brown hair, and blue eyes.