Why it's called human error
Doesn't have to be complex system either. Just has to involve humans. Or, in the following, humans + beer.
I was once present in a recording studio in the 70s when a famous English band was doing an album. In those days the big tapes used would hold about 30 minutes of music, so you would need two for an album.
You can guess what's coming. They were reviewing tracks on the first tape, and then all went to the pub, leaving the Tape Operator to sort out a new tape so they could start recording more stuff. The tape was so expensive that it was normal to reuse it, wiping it first, of course.
They came back from lunch, worked for many hours (this in the days when an album took months to record because it took that long to get them all there at the same time), and decided they wanted to listen to something on the first tape again.
The tape op went to the cupboard to get the first tape.........
The look on his face was a picture. I didn't know skin could go that colour. They forgave him. There are references to the incident on the credits for the eventual album. More than one, actually.
SO easy to avoid, but it wasn't avoided.