Paddington author Michael Bond died on the last day of filming, six months before the release of this movie, at the age of ninety-one. His previous book about the title character was released in April 2017. Books on Paddington have sold more than thirty-five million copies throughout his career.
One day after completing her demanding underwater scenes for A Forma da Água (2017), Sally Hawkins flew from Toronto, Canada, to London, England, to begin production on this movie, only to find out she would have to shoot underwater scenes for this movie as well.
The "pop-up-book" of London used in this movie was created in reality for a limited edition collector's item containing six illustrated pop-up scenes that had been taken directly from this movie.
The best-reviewed movie ever on Rotten Tomatoes. As of July 5, 2020, the movie has 239 Fresh reviews and no naysayers, overtaking one hundred sixty-three Fresh and zero negative critiques from previous record-holder Toy Story 2 (1999). (As of March 3, 2023, it has two hundred fifty Fresh and two negative reviews.)