Eric Blore tells Robert Montgomery that Robert the Bruce fought to gain the throne of England. He was in fact fighting for the throne of Scotland.
(at about 51 mins) The London Gossip editor, while talking to Jim, lets his monocle drop, then does it again in the next edit about one second later.
Frank Morgan disguises himself as a Danish count and introduces himself as Osric. But at a dinner party with the same people they call him Olaf.