Plot hole: Before the race starts, Sir Percy intends to sabotage some of the other fliers. He announces to Courtney that he had lured Dubois away by giving him the address of Courtney's daughter, but later, when the race starts, there is nothing wrong with Dubois' machine even though Sir Percy had the chance.
Those Magnificent Men in Their Flying Machines (1965)
1 plot hole
Directed by: Ken Annakin
Starring: James Fox, Sarah Miles, Stuart Whitman, Alberto Sordi
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)
Count Emilio Ponticelli: Like-a Caesar, we go to England.
Trivia: The sequence where the aeroplane lands on a train was shot on the Bedford-Hitchin railway line, which was closed in 1964.