When the film was first released, the title consisted only of seven hash marks.

I couldn't help but notice that the office that Mills and Somerset share is numbered "714". Just a coincidence, or a tribute to "Dragnet"? That was Joe Friday's badge number showed so prominently in the beginning of each episode.

When John Doe calls 911, there are two attendants. The female attendant is Rachel Schadt, personal assistant and music consultant to director David Fincher.

Just a note - look at the window of the cafe where Morgan Freeman and Gwyneth Paltrow are talking. It's the Quality Cafe, the same place where Nicholas Cage's mother worked in Gone in 60 Seconds. The interior is the same as well, you just see it from a different angle.

The dead man we see at the very beginning of the movie (whose "passion" is all over the walls) is Andrew Kevin Walker, the writer of the movie, in a cameo. He's credited as Andy Walker.

The reason Brad Pitt gets his arm in a sling is because at one point he actually fell onto a car windscreen and badly cut his hand, so they had to write it in - he's said in interviews he's really disappointed the cameras never caught it.

I noticed this in a moment of intense boredom: On the deluxe special DVD edition of Se7en, Gwyneth Paltrow is credited on the back as 'Gweneth Paltrow'. Just a small, insignificant mistake, but as it's not part of the movie I thought it was a slightly interesting piece of trivia.

In 1998 Boris Starling wrote a book called "Messiah" which is a murder mystery similar to "Se7en" in that the protagonists are chasing someone who murders brutally and with Christian motif. The killer in that book is called Silver Tongue and believes himself to be Messiah. In this film Mills tells Doe that he's not Messiah, and Sommerset calls Mills Silver Tongue. It's kind of a neat thing to notice if you've read the book.

The fingerprint technician who is running the 'Help me' fingerprints through the computer is actually Morgan Freeman's son, Alphonse Freeman.

R. Lee Ermey originally auditioned for the part of John Doe. After the part was given to Kevin Spacey, Ermey was offered and took the part of the police captain.

Kevin Spacey made sure that it was in his contract that his name would not appear in any press releases or reviews, that his photo would never appear in any of the above, he was not to be mentioned in interviews nor was his name to be anywhere in the opening credits. He sites his reason as being that The Usual Suspects and Outbreak were both opening earlier that same year and figured that people would start to recognize his name. And he also figured that if people saw his name in connection with the movie and he didn't appear for the first 2/3 of the movie they would know that he was playing the killer, thus ruining the element of shock and surprise that the moment in the movie has built up to.