In 2003 a man named Juan Catalan was arrested for a murder in Los Angeles. He repeatedly professed his innocence and asked to take a lie detector test, a request that the police denied. He also had an alibi: he swore that at the time of the murder he was at Dodger Stadium with his little girl, watching the Dodgers vs. the Braves, but his lawyer was unable to find him in any of the Dodger Vision or FOX footage he subpoenaed. However, he discovered that there was another source of crowd footage in the episode Curb Your Enthusiasm: The Car Pool Lane (2004), which had filmed at Dodger Stadium that night. Although Catalan did not make the final cut of the show, his lawyer was able to find him and his daughter in the outtakes, and determined from the timestamps on the tapes that Catalan could not have been the killer. When told that his show had released a wrongfully accused man from prison and a trial that could have led to the death penalty, Larry David commented, "I tell people that I've now done one decent thing in my life, albeit inadvertently."
There is no script to each episode, just a heavily detailed plot outline, which the actors all improvise. On average, each scene will require between 7 or 8 takes which is very high for a TV series on a tight schedule.
Whenever Larry inevitably finds himself lying to wife Cheryl about his latest convoluted mishap, actress Cheryl Hines is as genuinely in the dark as her character. That's because she is not privy to the full script outline, only being exposed to her own scenes.
Larry David and Richard Lewis, who has a recurring role as himself, went to summer camp together at the age of 13, lost contact and reconnected on the New York comedy club circuit nearly 15 years later.
At the start of the first season, Jeff Garlin (Jeff Greene) was still recovering from the effects of a stroke. The actor contends that the demands of filming a weekly TV series was instrumental in his full recovery.
Despite his on screen reputation as a misanthrope, the real Larry David will not joke about an actor's appearance unless he gets permission from them. For example, Jeff Garland has given him permission to call the character Jeff Green "fat" and in "The Pants Tent" Larry was concerned that when his character accused a woman of having breast implants that people would assume that the actress had breast implants.
In the first season, they filmed in an empty house for the Davids' home. When someone actually moved into the house, the production (and the fictional Davids) were forced into finding a different house.
The original idea for the show was to document the return of Larry David to the stand-up world, mixing it up with scenes from David's own life (a fictional version). When he started shooting that as a pilot, obviously changed his mind.