These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Hype Backlash: This short was marketed as taking hand-drawn traditional animation and "pushing it through a new process that would meld it seamlessly with CG." While it does achieve that goal splendidly, a development reel on YouTube reveals that the animators still had to start with CG in order to achieve this look, prompting both hardcore animation purists and veteran animation pros to claim the staff as "lying", and claiming unnecessary training. "Why go through this whole process if the end result is just going to look like hand-drawings?" They are in the minority, though.
Expect a lot of people to worship the short as a masterpiece of writing, design and character. Expect just as many people to disagree and get their heads bitten off by the fans.
Visual Effects of Awesome: How is it that a short that utilizes both 2D and 3D animation look so beautiful and move so lifelike?