On the show, suspects are routinely referred to as "unsubs", or unknown subjects.


Matthew Gray Gubler was once photographed by famed photographer Mia Grace who had a small part in the series' pilot episode.


CBS aired an episode after Super Bowl XLI (2007) (TV) in the hopes of transforming the series from a relatively modest hit into a top ratings performer. The episode featured cameos by Super Bowl announcers Jim Nantz and Phil Simms.


The character of Special Agent Reid was a child prodigy, having graduated from high school at the age of 12. Matthew Gray Gubler, describing what may form his character's genius, has said that Reid may have Asperger's syndrome and perhaps even be mildly schizophrenic. Reid's mother was schizophrenic herself.


JJ collected butterflies as a child.


Garcia isn't Hispanic, it's her step-dad's name. Elle is half-Cuban.


Mandy Patinkin, who plays Gideon, has a son named Gideon.


In the time between Lola Glaudini's departure from the show and Paget Brewster's arrival, footage is used in the opening credits that originally featured Glaudini. The footage, from episode 1.03, is digitally altered so that Glaudini does not appear.


The original title for Criminal Minds was Quantico, and the pilot was filmed in Vancouver. In the Quantico script, Jason Gideon was named Jason Donovan.


Mandy Patinkin's characters in both this show and "Dead Like Me" (2003) have many similar interests. They are both shown to be capable and enthusiastic chefs, and both have an affinity for art.


In the show's opening credits, mug shots of real-life serial killers and mass murderers are shown. Among the killers shown are John Wayne Gacy, Charles Manson, Richard Ramirez ("The Night Stalker"), Theodore John Kaczynski ("The Unabomber").


When David Rossi (Joe Mantegna) joins the team, he makes a comment that their offices are better than "that bunker" the BAU used to work out of. The comment isn't metaphorical. The actual BAU (in its many earlier incarnations and titles) used to operate out of a bunker former FBI Director J. Edgar Hoover had built below FBI headquarters in Quantico, VA.


Almost every single member of the BAU team uses a Glock pistol. Morgan and Hotch use a Glock 22, and carry a Glock 27 backup on their ankles. Morgan also opts for a tactical illumination attachment on his Glock 22 model. Reid uses a Glock 22 until early season four where he trades it in for a silver .38 Smith 65 3' revolver. Prentiss uses a Glock 23, while JJ uses a Glock 27, both of which were specified in a TV Guide Network tour of the props department. Jason Gideon used an older version standard Federal issue Sig Sauer P226 and David Rossi uses his own personal Springfield .45 caliber handgun.


In the time between Mandy Patinkin's departure and Joe Mantegna's arrival (a span of only 3 episodes) Thomas Gibson received the "Starring" credit.

The actress who plays "Lindsay Vaughan" in the episode "3rd Life" is Joe Mantegna's daughter Gina.