A famous line from The Importance of Being Earnest, also written by Oscar Wilde, is incorporated in the script, and spoken by Lord Henry Wotton: "The only way to behave to a woman is to make love to her if she is pretty, and to someone else if she is plain." In the play, which premiered several years after the publication of the novel this film is based on, the line is spoken by Algernon.
In Marvel's The Punisher (2017), episode The Punisher: Kandahar (2017), Billy Russo, played by Ben Barnes (who also plays Dorian Gray in this film), is seen reading the book 'The Picture of Dorian Gray' by Oscar Wilde. Both characters parallel each other, as both spend value in their good looks.
Colin Firth (Lord Henry Wotton) has worked on another project that involved Oscar Wilde: Colin played the character of Reggie Turner in the movie The Happy Prince (2018). The movie is about the latter years of Oscar Wilde's life.