I have encountered quite a few examples where paper charts were very much in error.
One of them resulted in a helicopter flying into an island not depicted on the charts being used, with the usual tragic result.
I've also had to fly and operate (as in find my way and land) in terrain where the only available charts were completely blank and annotated "not surveyed". No other navaids were available at the time and GPS was still at the military secret stage, the required satellites were not then even in orbit.
Not too many years ago the CAA miraculously re-situated the 1117' AMSL mast at Princes Risborough to a position to the north west of Kenley. Unfortunately it was the dominant obstacle to the north west of the LHR CTR and thankfully no-one flew into it because it was definitely still in its original place. It was some months before a chart amendment was issued.
The present CAA 1/2 mil charts were issued with errors showing active glider sites as disused airfields.....