Specs and materials can change over a span of that many years, but I'm surprised the publishers didn't ask professionals for review and revisions over the years.
I would sure love to see what some of the supposed "newly exposed" errors were.
Most likely there were things related to grounding, such as ground fault circuits.
Phil
Edit: I just remembered there were ground fault breakers installed in the 30+ YO house I just sold. They were only on the outside circuits and the bathroom circuits though. None near the kitchen sink.
Any interest in Cars, Trucks, Motorcycles, etc? Discuss them on TalkZilla. Click this link to sign up:
TalkZilla