Disney and Pixar are renowned for creating touching computer animated films which carry a message, moral or sentiment and tug on the heartstrings of new and old alike. This is done through hard work to make the animation top notch and by having all the areas like the musical score and pacing of the story come together to make a finished piece of emotive work.
So what do you do with significantly less development time and little room creativity, like most movie tie-in game developers have? Well, you make a fairly standard movie tie-in game; one with shortcomings young fans of the film will be more forgiving of but will still notice. Something playable enough to enjoy but unlikely to be remembered after the cinema and DVD release of the film have gone and past.