TIL about Titivillus a medieval demon that would feed on misspellings, mispronounced syllables and mumbled words. He was considered a natural enemy and tempter of scribes.
Back in 2016 while working on blog posts about the woodworkers depicted in misericords I encountered a devilish creature holding a scroll of paper. At the
There was some degree of standardization. Especially for important legal and religious texts alteration, even if accidental, was considered a sin/vice.
Scribes very often simply had to produce 1:1 copies of existing texts. So the standard was right in front of them.