punctilios

Punctilios are fine points of conduct, ceremony, or procedure—the small details of etiquette or formality that some people insist on observing.

The word carries a slightly archaic or formal tone and often appears in contexts where someone is being overly precise about matters of propriety.

He observed all the punctilios of diplomatic protocol.

Someone who fusses over punctilios may be seen as fastidious or pedantic, depending on whether the observer values such attention to detail.