[bluGill]

Maps Traditionally have a few intentional errors because those are copyright, in turn meaning if one is found you can sue for copyright violations.

[cwillu]

I know that's the common story, but I have never seen any actual court cases confirming that theory; certainly the recoverable damages from such copying such an error would be minuscule.

[technothrasher]

Wikipedia has an entry that lists a few court cases, mostly showing that this strategy, as you surmise, fails to stand up in court.

https://en.wikipedia.org/wiki/Fictitious_entry