I was just randomly going through redacted documents looking for more of those silly redaction mistakes. I didnt find any, but I did find some improperly de-classified documents.

https://www.war.gov/medialink/ufo/release_1/dow-uap-d32-miss...

They left the classification labels untouched (SECRET//REL TO USA, FVEY). They really are supposed to remove those or at least cross them out. To see a document on the public internet with those labels still attached is very odd behavior.