I can see the error but would not have if you hadn't told us to look for it, joybell. I'm with BeeBee, though. Now when I look at the quilt, that's the first place that my eye goes to. If you're the same way about it, and it bothers you, then you should definitely fix it. An hour or two spent now will be worth not having to see it for years and years in the future.
I still have an intricate cross stitch sampler that I made in graduate school. There is one small place where I used the wrong color of embroidery thread. All of my friends told me not to fix it, that no one would ever notice it. Well, perhaps they don't, but I do. Every time I look at that sampler, I see that error and it bugs me to this day.