Dexter has killed about 117 people according to the Dexter Wiki. He had 45 blood slides in his first box before it was destroyed and now has about 43 slides in his new box. Plus twenty or so people that he didn't collect blood from.
Series star Michael C. Hall revealed he was afflicted with Hodgkin's lymphoma in January 2010, but continued to work on the series. Most of his fellow cast members were surprised by the news, because he had not disclosed his condition during production. Hall is presently in remission as of mid-2010.
Though they play brother and sister in the series, having met on the show, Michael C. Hall and Jennifer Carpenter married on 31st December 2008. They subsequently divorced in December 2010, but continued to work together in the show.
Sgt. Angel Batista at times refers to Dexter as "socio" when speaking to him as a friend or in confidence. This is a clever English/Spanish play on words. While "socio" in Spanish means "associate" or "partner", it is also the beginning of the word "sociopath" (in both English and Spanish)
Dexter's 'knock-out' syringe ostensibly contains a solution of what he refers to as M-99 (Etorphine Hydrochloride), an animal tranquilizer more potent than Morphine used by veterinarians to sedate creatures as large as elephants. The substance can only be legally acquired and administered with a DEA license.
One aspect of the Trinity killer parallels the BTK killer. Dennis Rader maintained a very normal family life and was very active in the Christ Lutheran Church in Park City Kansas. Among many positions, he was a deacon and congregation president and Cub Scout leader. Ironically it was his use of a church computer that first led to him being caught.
The name of the main character, "Dexter," is also a Latin word meaning "right hand." The implied complement is the Latin for "left hand," "sinister," reflecting his hidden dark side. In 2010, author Jeff Lindsay confirmed at a book signing in Edinburgh that he chose the name Dexter because it was the opposite of "sinister", reflecting the character's surface normality.
Dexter frequently uses aliases that make reference to Bret Easton Ellis books and their film adaptations. These include using "Patrick Bateman" (the main character from American Psycho (2000)) when buying tranquilizers and "Sean Ellis" (reference to both Ellis and Sean Bateman - from The Rules of Attraction (2002)) when seeing a psychiatrist.
The opening credits sequence is replete with images symbolic of Dexter's daily forensic chores. The macro closeup of a mosquito on human skin (gatherer of blood). The closeup of a knife slicing into fruit dispersing the fruit's moist DNA into a mist (spatter evidence), etc.
While most of the shows are set in and around Miami, Florida, the series exteriors are mostly shot in Long Beach, California, with interiors shot at the Sunset-Gower Studios on Sunset Blvd. Second-unit crews shoot additional material in Miami to help add to the realism of the show.
The advertisement on Foxtel in Australia promoting Dexter was pulled after the South Australian government filed complaints regarding the mention of Adelaide (a city in South Australia) having the highest serial killer count per capita.
In many of the crime scenes where Dexter gathers photographic evidence for forensic evaluation, he uses a Nikon DSLR and a 105mm Micro Nikkor lens rigged with a Nikon R1 twin macro flash kit. This ensemble enables him shoot extreme close-ups without any shadow detail whatsoever, the preferred end result for such criminal investigations.
The names Dexter Morgan and Debra Morgan refer to the two laws of De Morgan - valid rules of inference in propositional logic. Informally, the laws are "not (A and B) is the same as (not A) or (not B)" and "not (A or B) is the same as (not A) and (not B)". They describe their mentality towards the existence of each other: Neither Debra nor Dexter can live without the other. Both characters express that several times throughout the series.
If the theme music sounds familiar, many fans have noticed that it is very reminiscent of the score from The Ipcress File (1965) by John Barry. Season 1: Ep. 12 is titled "Born Free" and features the Andy Williams rendition that serves as a clue for Dexter. This Oscar-winning song was written by Barry (& Don Black).
The use of bird's-eye views of coasts and cities from a helicopter has started a drinking game in some places (including Miami, Fort Lauderdale, and other cities in South Florida). Dexter talking about his childhood merits one sip, while a helicopter's view while flying above the relevant scenes merits two sips. (The glimpse of a helicopter from below doesn't count.)
According to Jennifer Carpenter, she always knew that Debra was in love with Dexter, and played her with that in mind from the beginning of the series. So she wasn't surprised when that storyline was introduced.