A good example of an author making big errors because she didn't understand British culture:

"The host pointed out two serious problems with her work. First, she assumed “sodomy” means homosexuality, but Sweet pointed out that, in one key case in her book, it was referring to child sex abuse. Second, she mistakenly believed the 19th-century legal term “death recorded” meant the convict was executed, but it actually meant a death sentence wasn’t carried out because the prisoner was pardoned and freed." Oops!

https://www.thedailybeast.com/naomi-wolf-realizes-theres-a-massive-mistake-in-her-book-live-on-radio