Factual error: Churchill tells his aide to fetch "Air Vice-Marshal Dowding". Dowding was actually an Air Chief Marshal, two ranks higher, and wears the correct rank insignia for that rank when he is seen later. As a keen military man, this is not an error Churchill is likely to have made.
Winds of War (1983)
1 mistake in Cataclysm - chronological order
Starring: Robert Mitchum, Jan-Michael Vincent, John Houseman, Ali MacGraw
Trivia: Herman Wouk, the author of the source novel, has a cameo as the Archbishop of Siena.