Disney’s Planes, set in the world of Pixar’s cars, started as Direct to Home Video project from DisneyToon Studios with most of the animation work done out of India via Prana Studios. At some point in the process the powers that be decided that the home video market wasn’t strong enough to support more releases and that the movie would need to be upgraded to a theatrical release. There isn’t one clearly identifiable moment but the shift in intensity is obvious between the start and end of the movie.
How can you tell? The world building got richer, the main character got a new voice with more of a spine, featured characters became multidimensional, supporting characters either fade into the background or gain more importance to the plot. It definitely makes for a stronger film, even if it has a bit of a multiple personality disorder.