I’m especially perfectionist in things I make myself (situations like yours, where the flaw doesn’t reflect on me, rarely bother me). But I see that this is really just an ego manifestation; the flaw bothers me because it doesn’t show me at my best. Knowing that makes it easier for me to just let it go (I try hard not to pander to my ego).
The Japanese have an aesthetic tradition of appreciating flaws, often trying not to make things too perfect. This meshes with the Buddhist understanding of “perfection in imperfection”: things are perfect just as they are, flaws and all. I also remember seeing a piece about a master artisan cabinetmaker (American, I think) who built a magnificent wardrobe—museum quality—and at the end found it too “precious”. So he pounded a big old gnarly nail into the front of it and left it there, bent and protruding. He was right. That nail gave it life.
Reflecting on all this makes me less anal about it all. It starts on a personal level, not being ashamed of my weaknesses and occasional failures, but seeing my own imperfections as an inevitable, and beautiful part of being human. Out of that personal assessment comes a willingness to let others see those flaws, in me and my work. From there, tolerance of flaws in others and in the environment is only a short step.