Continuity mistake: Wallis is showing his idea to the doctor and draws on the sketch of the dam. Shortly after, he shows the doctor the same sketch again and the middle line we saw Wallis draw has now changed position. (00:06:40 - 00:07:50)
Factual error: One of the shots of individual British Lancaster bombers approaching one of the dams is actually and incorrectly an American B17, seen for only a second or two. [At no time in the film is a B17 visible in the British release of the film. However the B17 crashing appears in a version of the film released in the U.S.A.]
Trivia: A (corrected) entry states that a USAAF B-17 'Flying Fortress' bomber is visible in the film. In fact in some prints produced for release in the US irrelevant stock footage of a B17 was randomly cut into the film to make it more acceptable to American audiences. This was a deliberate alteration of the film done very much against the wishes of the producer and director, and it explains the 'error' - the contributor has seen one of the non-canon US prints.
Farmer: Every time one of these Lancasters fly over, my chickens lay premature eggs.
Official, Ministry of Aircraft Production: You say you need a Wellington Bomber for test drops. They're worth their weight in gold. Do you really think the authorities will lend you one? What possible argument could I put forward to get you a Wellington?
Doctor B. N. Wallis, C.B.E., F.R.S.: Well, if you told them I designed it, do you think that might help?
Gibson: How many guns do you think there are, Trevor?
Trevor-Roper: I'd say there are about ten guns - some in the field, and some in the tower.
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