Trivia

Helena Bonham Carter's maternal grandfather, Eduardo Proper de Callejon, also rescued many Jews from the Holocaust, by forging Spanish exit visas.

In the newspaper obituaries after Sir Nicholas Winton died on July 1st, 2015, the UK press headlines dubbed him 'The British Schindler.'

The idea for the film came when producer Iain Canning saw a clip of Nicholas Winton on That's Life! (1973) and wondered about the story behind it. He and Emile Sherman, who, together, had recently established their See-Saw Films company, went to visit Winton, then 101 years old, in 2010. Canning describes him as "humble, generous and also incredibly kind," saying Winton was reluctant to be painted as a hero onscreen. "He believed that we all have the capacity to do the right thing at the right time," Canning recalls. A few years later, the producers enlisted screenwriters Lucinda Coxon and Nick Drake to adapt "If It's Not Impossible...: The Life of Sir Nicholas Winton," a 2014 biography of Winton written by his daughter Barbara Winton. She gave her blessing to the film - as long as her father was played by Anthony Hopkins.

The film is based on the true story of Sir Nicholas Winton who saved 669 children's lives throughout 1938 and 1939.

The title refers to the quotation "He who saves one life, saves the world entire." This was quoted in Schindler's List (1993), where it was stated, accurately, to be from the Talmud. It also appears in the Qur'an.