punctilio

noun2

1. •
   A fine point in exactness of conduct, ceremony, etiquette or procedure.

   • […]–but, a-propos, said he—Shakespear is full of great things—He forgot a small punctillio of announcing your name—it puts you under a necessity of doing it yourself. — 1768
2. •
   Strictness in observance of formalities.

   • This rudeness and official punctilio, however, brought forth a storm of protest from my fellow voyagers. — 1921