Factual error: The train liveries shown in the UK were well out of use by 1980. And the West Coast Railway (Company) did not exist at all.
Character mistake: On the train at the beginning of the movie, Colin Firth is talking to Nicole Kidman about Warrington. He states that George Formby was from Warrington and not from Wigan or Formby as people believe. George Formby was born in Wigan.
Suggested correction: He was born in Warrington.
Formby is buried in Warrington, but he was born in Wigan.
Factual error: When the Japanese take over Singapore they raise a "modern" Japanese flag not the wartime "Rising Sun" flag.
Factual error: Overhead wires are seen at the The Royal Border Bridge at Berwick-on-Tweed. These were not built until 1989.