Having encountered this spread across our orgs greenfield codebases which made heavy use of AI in the last 90 days: Restating the same information in slightly different formats, with slightly different levels of detail in several places, in a way that is unnecessary. Like a "get up and running quickly" guide in the documentation which has far more detail than the section it's supposed to be summarizing. Jarringly inconsistent ways of providing information within a given section (a list of endpoints and their purposes, followed by a table of other endpoints, followed by another list of endpoints). Unnecessary bulleted lists all over the places which could read more clearly as single sentences or a short paragraph. Disembodied documentation files nested in the repos that restate the contents of the README, but in a slightly different format/voice. Thousands of single line code comments that just restate what is already clear to the reader if they just read the line it's commenting on. That's before getting into any code quality issues themselves.