Factual error: Terry-Thomas's plane gets stuck between the carriages of a Paris-bound train (in fact filmed on the single-line track between Bedford and Hitchin). Just before the train plus plane goes into a tunnel you can see the cooling towers of Bedford's Goldington Power Station (circa 1960) behind TT's head. (01:58:20)
Continuity mistake: When the German colonel crash lands in the Channel, he first hangs directly under his upside-down plane before he has to let go, and the plane zooms in a straight line away from him. But as he resurfaces in the foreground, the plane comes in from the background's left before landing in the water.
Trivia: In the beginning of the movie there is a reference to a Frenchman who had crossed the Channel by plane in the previous year (1909). The man meant is Louis Blériot, who flew from Calais to Dover in his famous craft 'Blériot XI' in 37 minutes. Again it was a competition race, for a 1000 Pounds set by the London Daily Mail.
Trivia: The conflict between Oberst von Holstein and Dubois partly stems from the Franco-Prussian War (1870-71), in which France was defeated and the German Empire formed.
Trivia: The sequence where the aeroplane lands on a train was shot on the Bedford-Hitchin railway line, which was closed in 1964.
Count Emilio Ponticelli: Like-a Caesar, we go to England.
Sir Percy Ware-Armitage: And I've arranged for the Frenchman to be detained by a lovely young lady.
Courtney: Ho, ho, guvnor, I'll bet she's a bit of all right.
Sir Percy Ware-Armitage: You should know, Courtney, she's your daughter.
Courtney: But guvnor, she's an innocent young girl.
Sir Percy Ware-Armitage: Not is, Courtney, WAS.
Count Emilio Ponticelli: It is a pity that the race will now be won by a Protestant.
Mother Superior: A Protestant? Sisters, don't stand there gazing. This good Catholic needs our help.
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