I was on IMDB looking at the goofs for Percy Jackson. There was only five goofs listed. Did you catch any mistakes other than the ones listed below? Add a comment if you saw any others.

Revealing mistakes: When Percy, Annabeth and Grover come to Luke to ask for help he is playing Call of Duty with a Playstation 3 controller while on screen Xbox 360 buttons are seen.

Revealing mistakes: In the scene in Auntie Em’s. Where Annabeth first runs into Medusa, she is wearing a turban. According to lore, Medusa has a head full of snakes, rather than hair. In that scene there is a small piece of blonde hair visible peeking out of the right side of the turban. Uma Thurman has blonde hair.

Revealing mistakes: When Medusa first notices Percy she puts her glasses on the crazy lady’s statue but when they are later seen with the head she has glasses on.

Continuity: After Percy enters the Lotus Casino in Vegas, the designs on his blue shirt are suddenly gone.

Continuity: Pigeons outside the window of Percy’s house disappear and reappear between shots.

Source: Goofs on IMDB