Like when they delivered my dads letter to Kentucky when they read the first letter of the zip code as a 4 instead of a 9...
It was a very common problem before they started using bar code readers. The processing center I worked at covers the 109.. zip codes (Rockland and most of Orange counties, N.Y.), which was oftentimes confused with 709 (Memphis) or 909, one of the P&D’s in LA. Or someone would get dyslexic and confuse us with 190 (Philadelphia)
I had a check owed to me for a large amount sent from a town 20 miles away here in Maryland routed through Puerto Rico. Took weeks of tracing and phone calls to get it.