Like the other commenter, my mind also fixated on the mouse cursor. Great post on the fonts, but I spent most of my time seeing how the strange cursor behaved. I don't like it much, especially because there's some inconsistency once you're down hovering over the related posts.

However, there was one spot where I had to give it to them: when I hovered over the content about Google Sans Code, it expanded horizontally. For a second, I wondered what was going on, then it clicked that the content must be horizontally scrollable, which it was!

Of course, that could be shown with a much more obvious horizontal scroll bar...