Didn’t Notice Due to All the Sadness
People weren’t emotionally ready for what happened in the first ten minutes of Up. One moment, Carl is living a happy life with his dear wife, Ellie. Then, as the years go by, we learn that she’s barren and dies of an unknown disease. However, to make things even worse, we get to see her health deteriorate. What fun, Pixar!
But if you paid attention to the background of Up during these crucial scenes, you might’ve noticed that the buildings in the background grow taller over the years. That’s because over the span of X number of decades, the city would continue to develop. Nice catch, Pixar!