Creator Backlash: Mandy Patinkin has gone on record saying he considers his tenure on the show the biggest mistake of his acting career, due to how disturbing he found its content, despite critics widely praising his performance.
Cowboy Bebop at His Computer: In the Season 7 episode "There's No Place Like Home" which aired in late 2011, a newscaster says a recent tornado was rated an F2 on the Fujita Scale. Except the Fujita Scale was replaced by the Enhanced Fujita Scale in February 2006 and the rating scale changed to EF0-EF5.
Directed by Cast Member: Recently Matthew Gray Gubler got to take the directing skills he's honed on other projects and direct episodes of the show ("Mosley Lane", "Lauren").
Executive Meddling: JJ was written out and Prentiss' screen time was reduced for season six, due to budget cuts, leaving Garcia as the only regular female cast member. Naturally, the fans were not pleased. Especially the female fans. And neither is the entire cast and crew, as expressed with, among other things, pointed double-meaning lines in "JJ". It was made worse by bringing in a new female lead to replace JJ (though she doesn't have the same job). Thanks to the fans, they were brought back as regulars for season seven and the Replacement Scrappy went bye-bye.
In light of the producer's comments about always intending to bring JJ and Prentiss back, an alternative explanation from industry workers has appeared on several sites. That explanation being that the producers wanted to more heavily focus on Prentiss for at least part of the season and explore her mysterious past. As part of this they needed someone to have the access that JJ's new job gave her for story reasons. However, experts in union contracts say that AJ Cook was cut as a regular because keeping her at that rank would mean paying her for all episodes of the season even if she was not in them, at a huge expense. Same with cutting back Paget Brewster's contracted number of episodes given that they knew she would be missing from several. But they had always left open a way to bring back Emily at any time both in story and contract.
Several actors who played bit parts/recurring roles on Supernatural are minor characters in this show. "The Thirteenth Step" has Jess as one half of a young couple on a killing spree, Lilith's child vessel was abducted to be Stockholm Syndromed into a twisted Roma marriage in "Bloodlines", Lucifer's second-choice vessel was a cop in "Brothers in Arms", and Rufus was an unhelpful police chief in "Legacy."
Several actors who played characters on Desperate Housewives have guest-starred on this show. Rex Van de Kamp was the defense attorney Hotch profiled in "Tabula Rasa", Zachary Young was the unsub Reid identified with in "Elephant's Memory", and Tom Scavo was part of the family the unsub was targeting in "The Caller".
Real-Life Relative: The victim the team is working to save in "3rd Life" is played by Gina Mantegna (who now credits herself as Gia Mantegna), Joe Mantegna's (Agent Rossi's) daughter in Real Life.
Recycled Script: Billy Flynn's origin is nearly identical to Frank's, and he has a lot of similarities to Karl Arnold/The Fox.
What Could Have Been: The show was originally going to be called Quantico and Gideon was originally named Jason Donovan. An early version of Hotch was described as a "blond haired, blue eyed Mormon" and Lukas Haas (the guy who played The Footpath Killer) originally auditioned for the part of Reid, and might have even got it if he hadn't begun expressing doubts about doing a series.
Writer Revolt: In "JJ", listen very closely to the dialogue. AJ Cook was let go from the show for purely financial reasons, a decision that the cast and crew obviously reviled, and the subplot is about how her promotion is being forced by "people above their pay grade" (the network). She really lays into them in her closing monologue in place of the usual ending quote.
Considering how the writers, the cast and the entire fanbase hatedwhat the network executives did, there is a general consensus that the Take That against them was entirely justifiednote and cathartic (and one of the few times when a Writer Revolt has been fully supported by more than just fanbase splinter groups).
Fortunately there is a happy ending to all this as Cook became a series regular again at the start of season seven. The main reason she was let go was so the execs would have money to do that spin-off, but it got cancelled after only 13 episodes. With their funds now freed up, CBS soon rehired Cook, perhaps knowing that there would be a good chance of a sharp drop in ratings if they didn't bring her back.