The Thirty Nine Steps

Continuity mistake: As the Prussian agents escape by carriage with Hannay after 'springing' him from police custody, you can see modern markings on the road for a car parking space.

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Mistakes

Factual error: The carriages on Hannay's train feature British Rail 'class' totems on the windows. These didn't appear until the 1950s, yet it is supposedly 1914.

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Trivia

Trivia: When Richard Hannay is hanging on the minute hand and you get shots of the clock gears bouncing about, they appear to be car gearbox internals. There is definitely an BMC A-series differential in there.

cachalot

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