The young Waterloo veteran who continues to wear his redcoat during the film can be seen in one shot with Corporal stripes whereas the rest of the film his tunic is that of a Private.
Henry Hunt uses the word "normalcy" which had not been "invented" until U.S. senator Warren G. Harding misspoke during his successful 1920 run for President.
The Mail Coach is not a font - it is hand painted with lettering to match the early 1800s one in the London Science Museum.
John Tyas introduces himself as a reporter from the "London" Times. That newspaper was and is known simply as "The Times." No employee would refer to it in any other way.