The main characters from the first three movies DO NOT voice themselves. Their audio clips from the movies are used instead.
Throughout the game, there is a teddy bear hidden in some levels and somewhere in the free roam too.
The dialogue from the first three segments of the game are all dialogue clips from the movies off which they are based (Jurassic Park, Jurassic Park: The Lost World, and Jurassic Park III). However, much of the dialogue from the Jurassic World portion of the game was recorded by the actors specifically for the game.
One level, in Jurassic Park 3, has a segment where Eric and Alan have to heal an Anyklyosaur, this is actually based on a deleted scene from Jurassic Park 3, where an Ankylosaur and a raptor where supposed to fight.
To this day, this is the only game that lets you fully explore Isla Nublar and lets you play as humans or dinosaurs.