1. Based on a novel
Although not everyone knows it, The Devil's Advocate is the film adaptation of the homonymous novel by the American writer Andrew Neiderman; although as usual in adaptations, what happens in the film ends up being quite different from what happens in the book. For example — Spoiler Alert! — In the novel Kevin never commits suicide, instead, he manages to "kill" the Devil.
2. A careful paper
We all know the professionalism of Keanu Reeves thanks to the 6 months he spent learning kung-fu to make The Matrix. Obviously with this film something similar happened; Before shooting began, the actor spent several months in New York, visiting law firms every day to learn the ins and outs of the trade.
Likewise, the actress Charlize Theron worked together with a group of psychiatrists to perfectly interpret a person with schizophrenia.
3. Donald Trump and an evil place
The private apartment of the current President of the United States, Donald Trump, was used during the filming of the film as the home of Alex Cullen, the client accused of murdering his family in cold blood, whom Kevin Lomax has to defend..
4. Symbolism, Kevin's "darkening"
As the film progresses we can see how Kevin Lomax's suit becomes darker and darker. At first, we see him wearing light colors, then various shades of gray getting darker, until he gets to the black suit that the movie ends in.
Obviously, this is a resource that the director uses to show Kevin's progressive passage into darkness as he advances as a star lawyer for Milton's studio.
5. Classic Tribute
The devil's name refers to John Milton, author of the classic poem Paradise Lost, which narrates the fall of man from God's grace. Right at the end of the film, Kevin uses the phrase "better to reign in hell than to serve in heaven", which is part of the said poem.
6. A troubled scene
Near the end of the film, Kevin goes outside to find a desolate New York. The scene is identical to that of the film Abre los Ojos (1997), where the protagonist Eduardo Noriega takes to the streets of Madrid in the same way. Being two films from the same year, some controversy was generated, although it was never possible to determine if one of the two actually copied the other.
7. Another cast, another director
Although the film was released in 1997, the project had been underway since 1994. Although at first things were a little different... Joel Schumacher would be the director in charge of directing the film and his options for the role of Kevin Lomax were Brad Pitt, Christian Slater, and, John Cusack.