The snowball fight scene was filmed in the historic Elm Hill area of Norwich, UK. Over 80 local people, some of whom work in the shops and business converted for use in the film, were used as extras.
All of the shops in Cobbleton are named after historical African American inventors.
The location used for Gustafson's factory is the site of the largest operating rotative beam steam engine in the world. A YouTube video of the site can be found by searching on the term "The Biggest Operating Rotative Beam Steam Engine At Crossness." It is an engineering marvel.
Cinematographer Remi Adefarasin, OBE BSC was the first black Director of Photography to be nominated for an Oscar.