There is a tendency to assume that official records (or semi-official ones, like parish records) have been competently compiled by well informed and educated people, but often that is not the case, as I discovered when I needed a copy of my father's birth certificate. He was born in 1908 in Sydney, Nova Scotia, so naturally I applied to the appropriate office in Nova Scotia. They told me that they couldn't provide a birth certificate (I don't know why not, as they sent one to my nephew a couple of years later) and offered a photocopy of the relevant page of the birth register. In one short paragraph there were no fewer than four mistakes: my father's second given name was garbled to the point that it was gibberish; my grandfather's birthplace was (trivially) misspelt; his occupation was completely wrong; and I don't remember what the fourth was.