Win Min Than's husband was so jealous about losing her to the film's "decadent" Hollywood star Gregory Peck, he ordered his wife to eat garlic before romantic scenes with Peck. Fortunately, the production crew was able to convince her husband that Peck and the others were respectful of her so he went home leaving her to finish the picture in peace.
The first of 2 movies in a row which Gregory Peck made in Britain to avoid paying US taxes. The second was Man with a Million (1954). He was paid $350,000 for the 2 pictures. The highest marginal individual income tax rate in the US at the time was 91%.
Blore's quote, "Theirs not to reason why...", is from "The Charge of the Light Brigade" by Alfred Lord Tennyson.
Just before the crash Peck's navigator references "Where the dawn comes up like thunder". This is a quote from Mandalay by Rudyard Kipling.