Concept
See also: List of celebrities appearing on Curb Your Enthusiasm
The show's natural, fly-on-the-wall style – together with the fact that David and many other characters play "themselves" – have contributed to the show's blurring of distinctions between fiction and reality, again echoing Seinfeld.
Guest stars frequently play key roles. Ted Danson and Wanda Sykes often appear as friends of the Davids. Shelley Berman plays Larry's father. Former Seinfeld stars Jason Alexander and Julia Louis-Dreyfus, along with Martin Scorsese, Alanis Morissette, Hugh Hefner, David Schwimmer, Mel Brooks, and Ben Stiller have all appeared as themselves. Jerry Seinfeld and Stephen Colbert made uncredited cameo appearances in the Season 4 finale. Dustin Hoffman, Sacha Baron Cohen and Bea Arthur appear in the Season 5 finale.

Larry David (as himself) – Rich, prickly, and socially obtuse, David has terrible luck in social situations and is often on the losing end of heated confrontations with "the help" — waiters, retail clerks, secretaries, etc. His problems are often caused by his own petty neuroses and obstinacy, which render him incapable of admitting fault, accepting blame and letting matters rest. At the same time, he is often a victim of circumstance and the over-sensitive and easily-offended natures of those he happens to encounter.
Cheryl David (played by Cheryl Hines) – David's wife. A foil for David, she is alternately patient with and exasperated by his eccentricities.
Jeff Greene (played by Jeff Garlin) – David's friend & manager. He doggedly sticks up for his client and friend. Obsessed with sex, Jeff often involves Larry in covering up his marital infidelities and hiding his pornography.
Susie Greene (played by Susie Essman) – Jeff's wife. Her relationship with Jeff is mercurial, leading to numerous separations in the course of the show. She often reacts to Jeff and Larry's shenanigans with angry, profane tirades in which Jeff is usually referred to as a "Fat Fuck." Often shows more affection to her dog, Oscar, than her husband.
Richard Lewis (as himself) – A neurotic, recovering alcoholic standup comedian. He is one of Larry's oldest and closest friends, having both moved from New York to LA to pursue their comedy careers. Characters
See also: List of Curb Your Enthusiasm episodes
With the exception of Season 1 (2000), seasons of Curb Your Enthusiasm are linked by a story arc. David took a similar approach on Seinfeld during seasons four and seven.

Season 2 (2001) – Larry David pursues a new television project, first with Jason Alexander, and then Julia Louis-Dreyfus. The premise: an actor who starred in a famous television show (Seinfeld being the obvious reference point) finds it difficult to secure work because of the public's strong association with their famous former character. David pitches the idea to executives for several different networks, who are initially receptive but ultimately back away for a variety of reasons, usually involving a mishap with Larry.
Season 3 (2002) – David joins a restaurant venture with a group of investors that includes Ted Danson. The season ends with the restaurant's grand opening. A sub-plot involves him being cast in a Martin Scorsese movie.
Season 4 (2004) – David works with Mel Brooks, Ben Stiller and David Schwimmer to star on Broadway in The Producers. He also struggles to fulfill his wife's tenth anniversary present to him – a one-time-only extramarital sexual encounter.
Season 5 (2005) – Larry's friend, comedian Richard Lewis, is in dire need of a kidney; out of sheer feelings of paranoid guilt, Larry offers one of his own kidneys to Richard if he cannot find a suitable donor in time. Larry then makes many concerted, ridiculous efforts in finding Richard a kidney donor, including frequent visits to Richard's estranged, comatose cousin, in the hopes that he will pass away, resulting in a perfect kidney for Richard, and also befriending an Orthodox Jew who happens to be the head of the kidney donation board. Larry also feels excited that he may be adopted due to a misunderstood word his father said (and no longer remembers) while in the hospital; Larry hires a private investigator (Mekhi Phifer) to look into it. Plots
HBO has officially confirmed that there will be a sixth season of Curb Your Enthusiasm.

Season 6

In "Chick Cancer", an episode of Family Guy, CYE's theme music is parodied when Luke Skywalker is left confused after arguing with a fellow Rebel fighter pilot about the attack on the Death Star during the Yavin 4 briefing.
In "Making a Stand", an episode of Arrested Development, Rolando asks Michael if the improvisation will be "unscripted like Curb". The same scene involves the actor Lobo Sebastian, who played Jesus in the "Christ Nail" episode of Curb Your Enthusiasm. Jeff Garlin (Jeff in Curb Your Enthusiasm), also appears as recurring character Mort Meyers on Arrested Development. Other actors who appear in both shows include Mo Collins (Richard Lewis' Nurse in Curb and Starla in Arrested Development) and Bob Einstein ("Marty Funkhouser" in Curb Your Enthusiasm and Larry Middleman in the third season of Arrested Development).
In the 2005 movie The Upside of Anger, Kevin Costner's character and two girls are watching TV, and though the screen is never shown and the sound barely audible, closed captioning confirms they are watching Curb Your Enthusiasm. They are watching "Trick or Treat", where David is complaining about two girls defacing his house after he refuses to give them candy. Mike Binder, who directed "The Upside of Anger", appeared in the CYE Season 2 episode "The Massage".
In The Sopranos episode "Where's Johnny?", Junior Soprano is seen watching the episode "The Doll". Due to his increasing dementia, he mistakes Larry David for himself and Jeff Garlin for Bobby Baccalieri, and is confused as to why they are on television. Perhaps in reference to this, one plot strand of the Curb episode "The End" revolves around a missing Sopranos DVD.
In "Hamburger", an episode of Tim and Eric Awesome Show, Great Job!, music commonly used in episodes of Curb Your Enthusiasm plays during awkward interactions between the title duo and comedian Neil Hamburger. The "Frolic" theme song to Curb Your Enthusiasm also plays over the end credits sequence. Trivia
A Curb Your Enthusiasm book was released October 19, 2006, published by Gotham Books (ISBN 1-59240-230-5). The book contains:

stories from Larry David's past
original interviews and commentary
episode outlines
episode guide
over 100 full-color photographs Music

Larry David
List of celebrities appearing on Curb Your Enthusiasm
Seinfeld