New Line Cinema forced Alex Proyas to include the opening narration by Kiefer Sutherland, which Proyas objected to, saying it was unnecessary. The narration gives away several key plot twists and consequently many fans of the film prefer to watch it with the sound turned off during the narration until Sutherland looks at his pocket watch. Unsurprisingly, the director's cut omits this opening narration.
The name of Kiefer Sutherland's character, Daniel Schreber, is the same as that of a man who wrote a book titled "Memoirs of My Nervous Illness" during the heights of a period in which he was institutionalized for schizophrenia. The book has become a standard reading for many psychiatrists and psychologists, and many of the theories of both Sigmund Freud and Carl Gustav Jung were based on it (Freud never actually met Schreber, though). "Dark City" borrows heavily from the concept of "fleetingly-improvised men" which are found within Schreber's "Memoirs".
(at around 10 mins) The music which Inspector Bumstead is playing on his accordion in his very first scene in the movie is a song written in 1939 by a Polish-Jewish composer Jerzy Petersburski which was originally called "Mala blekitna chusteczka" ("Little Blue Handkerchief"). The lyrics were later translated (with slight differences) to many languages and it became especially popular in Soviet WWII era under the title "Siniy Platochek" ("Blue scarf"). The song lyrics tell about an unhappy, lonely man who wanders aimlessly around the world thinking about his lost love which is gone forever. His only memento of his beloved one is the blue handkerchief from the title. As the movie is about our memories, the song actually fits the movie mood quite well.
On the DVD commentary, co-writer David S. Goyer reveals two possible explanations for the origin of the inhabitants of Dark City. In his original story outline, director Alex Proyas believed the humans to have been passengers aboard an interstellar spaceship who were captured by the Strangers. Goyer favors a more spiritual approach, supposing that the humans are in fact dead and that Dark City is a sort of purgatory made up of people the Strangers have selected or abducted from different eras in history.
An over-sized version of Dr. Schreber's syringe (roughly a meter long) was built for the close up shots of the needle being extended so that its surface details would be visible in the focal plane of the camera lens.
The movie appears to take place in the early 1960's/late 1950's. Cars and clothing appear almost exclusively from that period. Also, in the flashback of Keifer Sutherland's character being forced to erase his own memory he's seen wearing an old-style medical smock favored by doctors of the period. This reinforces the idea that he was a kidnapped psychiatrist being used by the aliens to manipulate human memory.
The trivia items below may give away important plot points.
This film deals with 'Last Thursdayism', a philosophy described in a satiric comment by 20th-century historian Bertrand Russell, referring to the "Omphalos" papers (1857) of Philip Gosse. Last Thursdayism says that the world (with us and our own basic memories included) could have been created recently, even last Thursday, but we cannot demonstrate such a thing because the world would have been created to look like an older world.
at around 1h 16 mins) According to Director Alex Proyas commentary on the Director's Cut DVD, test screening audiences were "troubled" by the notion that the entire city wasn't sucked out into space once the Shell City Wall was breached. Thus, a last minute SFX addition of Bumstead and a Stranger drifting through a force field was created.
at around 2 mins) At the beginning of the film, there is a brief shot of the movie theatre which says "Now Showing, The Evil, Late Show Nightly" and to the right, "Coming Attractions, Book of Dreams" (a previous film by Alex Proyas). At the end of the movie the marquee still says Book of Dreams - Dream 3: Welcome to Crateland (1994) is coming soon, even though the theater and marquee have changed.
Near the end of the film, there's a shot of Jennifer Connelly (Emma/Anna) at the end of a pier looking at the ocean. This shot was repeated in Connelly's later films "Requiem for a Dream" (2000), and "The House of Sand and Fog" (2003).
Both Jennifer Connolly and William Hurt played in two Hulk movies respectively. Jennifer played Betsy Ross in the Ang Lee version. While William played General "Thunderbolt" Ross in the Incredible Hulk.
at around 14 mins) According to the list that Bumstead shows to Emma, the names of Murdoch's victims are Michelle Davies, Alison Montgomery, Samantha Richards, Kathleen O'Shea, Simone Shaunessy and Beth Mulligan.