Preview still overwrites pictures without prompting for confirmation. Nice it saved tons of pictures in low-res without any warning. It could at least save a copy of the originals...
Also, try plugging an external display, open some PDFs and go back to the built-in display -- the Preview's windows lose their toolbars. Weird.
Finder is still a mess. Windows Explorer is way better. The only way to make Finder look and work good is using TotalFinder. TotalFinder's tab mechanism (Chrome-like) is a lot better than Finder's standard functioning (Safari-like). Who do really like opening things in a new window instead of a new tab??? TotalFinder also allows displaying dual tabs in a split-screen fashion. Really useful for moving files. I expected a decent Finder after years of OSX existence, but we still have a pretty raw filesystem browser.