Personally, I would keep it. In my opinion, these are very very minor problems or not even an issue.
If the leather was damage, I would be more concerned. The zipper part I never use it, so I don't even care.
And the uneven stitches are on the bottom, so it's only you lift it upside-down and check it; otherwise, you don't see them for being uneven.
However, this is your bag. If you are unhappy and unsatisfied, you might just return it.
Maybe you can ask your SA and see if they can transfer this colored nano from other
Nordstrom.
Hope this help you something.