First collaboration between Amazon and Warner Bros. Amazon is providing more than a third of the film's budget and has exclusive streaming rights and distribution through their entertainment platform. Warner Bros. has control over theatrical and global distribution.
In the book "The Goldfinch," Boris (played by Aneurin Barnard in the film) says "Oh, yes. Prince Boris! War and Peace. I'm named like him. Although the surname of Prince Boris is Drubetskoy." Aneurin Barnard played Boris Drubetskoy in the 2016 TV mini-series War & Peace (2016).
The painting featured in the novel, The Goldfinch, is work by Carel Fabritius from 1654. It belongs to the collection of the Mauritshuis in The Hague, Netherlands. Author Donna Tartt first saw the painting 20 years before the release of the book.
Finn Wolfhard was not John Crowley's first choice for young Boris, as Crowley wanted to cast young Russian theatre actors from New York, but Wolfhard ultimately won the role by impressing Crowley and dialect coach Kristina Nazarevskaia in his audition with a perfect Russian accent.