Revealing mistake: This actually happens throughout the entire show but is most obvious at the beginning of this episode: When they are in the churchyard it is obviously a studio stage, as there are shadows at all angles around the cast from the studio lights. Also, the lights are quite prominently reflected in Arthur Lowe's glasses.
Dad's Army (1968)
1 revealing mistake in season 7
Starring: John Laurie, Arthur Lowe, John Le Mesurier, Clive Dunn, Ian Lavender
Don't Forget the Diver - S4-E2
Factual error: While Capt. Square is looking through his binoculars at what he thinks is Mainwaring's platoon marching with their rifles, a 1960's Bedford lorry drives past on the road behind them.
Frazer: Sorry about the candles. The blinds are a bit thin for the gleam of the gas light.
Godfrey: Oh, I like candles. They're more romantic.
Trivia: The only member of the cast to have actually served in the Home Guard was John Laurie. Arthur Lowe, John Le Mesurier, Clive Dunn and Arnold Ridley were in the regular army.
Question: A set of complicated events mean that Captain Mainwaring and some other members of the platoon have to drive a railway engine. After they leave the railway station it turns out that the railway engine has no brake wheel and cannot stop. The ARP warden, the mayor of Walmington, the vicar and verger take the brake wheel, jump on a handcar and chase after the engine. Catching up with the engine, they throw the brake wheel to Captain Mainwaring. The engine then reverses, so they must pedal the handcar even faster to avoid being run over. Could four men (all obviously in late middle age, and past peak fitness) pedal a handcar to outrun a railway engine at full steam? When the engine reverses, why do they pedal the handcar to stop being run over? Why don't they jump off the handcar, then pull the handcar off the track? (Also it takes the engine less than a minute to reverse. In reality, it would take several minutes to change a moving railway locomotive from forward to reverse).
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Answer: The show is a comedy, this was played for comedic effect and to show that in times of extreme fear, in this case about to be crushed by a steam train, the men had an adrenaline surge strong enough to pedal fast enough.