Fans of royal weddings might enjoy the BBC’s attempt to educate the rest of the world about what to expect on May 19, 2018:
A non-Brit’s guide to Meghan and Harry’s wedding (BBC, May 7, 2018).

Can you spot the blunder in this screenshot from the article?:

Answer:
Actually, Diana and Charles were not married at Westminster Abbey.
“The wedding of Charles, Prince of Wales, and Lady Diana Spencer took place on Wednesday 29 July 1981 at St Paul’s Cathedral, London, United Kingdom.” (Wikipedia)

St. Paul’s Cathedral:

Westminster Abbey:

Update:
On May 8, BBC have changed the wording: