In Harry Potter and the Half Blood Prince, Cornelius Fudge tells the Prime Minister that the previous one “tried to throw him out the window.” HBP is set in 1996, the PM was John Major. Before him it was Margaret Thatcher.
MARGARET THATCHER TRIED TO THROW THE MINISTER OF MAGIC OUT THE WINDOW.
SHE WASN’T CALLED THE IRON LADY FOR NOTHING.
I’m sure at least for 20 years we will continue to find minor details like this about Harry Potter series