A trend (not really nav per se) that really irks me is the video at the top that follows you into the corner of the screen as you scroll. Oh and of course its also autoplay...

Do you have a good example of that? I'm not 100% sure I know what you mean...

I find it happens on news sites most of the time. Here is a random link from CNN: video playing behavior

It will start playing automatically and once it does it will jump to the top right if you scroll down far enough. It breaks my expectation that if I don't want to see something then I'll scroll it out of my window. You could argue that its a feature to allow you to read the details while the video is still visible but I'm not a fan.

Really like sub nav on responsive for mobile.  Frustrating when you're trying to navigate a site and it keeps loading top level nav items faster than you can tap the sub nav items LOL

I also like the idea of small caps.  Makes it clear.