For example, the search bar in the 'All apps' section of the phone. It is so small and long, would make sense for mouse and keyboard, but not phone. Not sure if it is a problem with Lumia 640XL in particular because of it's gigantic display but tiny amount of pixels (720p).
Well that search bar looks pretty consistent and cool on my 5" 640. I mean, it all fits nicely. Altough it does reminds you of something you see on desktops from time to time.