Outside the polling station, a Labour party worker calls out to someone "Can ask how you voted?" This is not legal in British elections. He can ask for their polling number or they can volunteer their address allowing the party to check them off against a list of electors. The voters can choose to say who they voted for. But no one can ask them. Its part of the secrecy in the secret ballot.
When Wills takes photographs he taps on the shutter release instead of squeezing it. Perhaps the actor had some mistaken notion of split-second precision, but by punching the button, he made sure that every photo he took would be blurred.
A photo is shown of the "Cambridge University Debating Society". There is no society of that name.
Ever since 1815, the Cambridge Union has been the university's debating society.
McDonald, who is addressed as 'Major' in the script and wears the rank insignia of such, is incorrectly listed in the credits as a Captain.
The election declaration includes the name, party and votes of each candidate.
At that time only the name and votes were read out. When declarations were broadcast the reporter would typically add the party between the name and the vote, e.g. "John Smith" (reporter: "Labour") "5432 votes".
When Mr. Foyle is show the 'D-F hut,' he is told that the hut must be 'at least' 100 yards away from the main building, but when shown, from the men's view or the view from behind the hut back towards the men with the main building behind them 'at least 100 yards' does not seem apparent.