In the movie, the infertility crisis is the result of all women being infertile. In the original novel by P.D. James, it's the result of all men producing no sperm.
Sir Michael Caine plays an award-winning political cartoonist. In his house, you can see some of his cartoons in the background. They were drawn by Steve Bell, an award-winning political cartoonist for The Guardian newspaper.
Writer and director Alfonso Cuarón stated that he "didn't want to make a film that ends when the credits roll. He wanted to make a film that, when the final credits roll...that's really the beginning of the film."
Writer and director Alfonso Cuarón said in one interview that he wanted to shoot this movie like La bataille d'Alger (1966), rather than Blade Runner (1982), almost like a documentary about something that happened back in 2027.
Almost every shot contains an animal, usually a dog. This is because, in the novel, humans treat their animals like the children they can never have.