David Duchovny didn't want to work on TV anymore, exhausted after his experience on The X-Files. He said he agreed to this show because he liked Hank's relationship with Becca.
At the Paley Center's 2013 New York television festival, David Duchovny announced that he didn't want Gillian Anderson to work on the show because he wanted to preserve the memory of their partnership on The X Files.
According to David Duchovny, ever since the show moved from being aired in the fall to being aired in the spring, creator Tom Kapinos has written every season finale as a possible series finale. This is because the shooting schedule hasn't changed that much, so when the show premieres in January, the season has been shot for months.
"Californication" is a portmanteau of 'California' and 'fornication'. Its origin is bumper stickers in Oregon in the late 1970s and early 1980s that read "Don't Californicate Oregon". Red Hot Chili Peppers' 1999 album "Californication" sold over 15 million copies, and as of 2009 is their most successful record.
Creator Tom Kapinos claims that the inspiration for the show came from his personal frustration because he worked for 4 years writing on Dawson's Creek (1998) when he didn't feel what he was writing.
References are made to actors from the TV show Dawson's Creek (1998). Katie Holmes is referenced along with real-life husband Tom Cruise in the movie 'A Crazy Little Thing Called Love' based on Hank's book. James Van Der Beek is referenced on a wedding invitation card that reveals Karen's last name to be 'Van Der Beek'. Writers/Executive Producers Tom Kapinos and Gina Fattore both worked on Dawson's Creek (1998).
The poem, printed on a poster, one can see in the intro is from Chinese poet Li Po (Li Bai): Facing Wine Never refuse wine. I'm telling you, people come smiling in spring winds: peach and plum like old friends, their open blossoms scattering toward me, singing orioles in jade-green trees, and moonlight probing gold winejars. Yesterday we were flush with youth, and today, white hair's an onslaught. Bramble's overgrown Shih-hu Temple, and deer roam Ku-su Terrace ruins: it's always been like this, yellow dust choking even imperial gates closed in the end. If you don't drink wine, where are those ancient people now?
The trivia item below may give away important plot points.
The opening episode to season 4 shows Hank's mugshot in the book store window with Mia's face publicizing the underage affair they had. There is no cut on his cheek, like he had when he was taken into jail.