Bob Odenkirk initially refused to reprise the role of Saul Goodman because he said Breaking Bad had been satisfying enough for him and he wanted to spend time with his children. His children encouraged him to return, telling him it would be good.
Jeremy Shamos and Julie Ann Emery, who played the Kettlemans, were given the freedom to improvise because the producers liked the pair's chemistry so much.
Bob Odenkirk is the only actor who appears in every episode.
Aaron Paul said he had had 'serious talks' with director Vince Gilligan about a possible guest appearance, but later told the Huffington Post that it would not happen. Even so, before the first episode of season 6 aired, the Better Call Saul Twitter account announced that both Jesse and Walter would appear.
Rex Linn's character owns a bank (Mesa Verde), and in real life, before he began acting, he was a vice president at a bank.
On June 27, 2022, it was announced that comedy legend Carol Burnett would join the cast in the second half of the final season as a character named Marion.
In the first episode, we learn that Saul Goodman's real name is Jimmy (James) McGill; the character uses this name for most of the series. Jimmy McGill (Bob Odenkirk) had been mentioned in Breaking Bad (2008). 'Saul Goodman' is in fact a persona created by Jimmy McGill.
Mark Margolis, who played Hector Salamanca, died on August 3, 2023, at the age of 83 after a short illness. Bryan Cranston (Walter White), Bob Odenkirk (Saul), Giancarlo Esposito (Gus), Dean Norris (Hank Schrader), Michael Mando (Nacho Varga) and Peter Gould (co-creator of Better Call Saul) paid tribute to the actor. Cranston said Margolis was 'fun and engaging off set' and 'loved to share a good joke'.
According to Rhea Seehorn, her character Kim Wexler comes from a small town called Red Cloud near the Kansas-Nebraska border, and grew up there.
Despite appearing as a main cast member, Michael Mando (Nacho) appeared in only 4 of the 10 episodes of season 1.
As a child, Bob Odenkirk lived in Berwyn, IL, a suburb of Chicago; it neighbors the suburb of Cicero, IL. In season 1, Jimmy mentions Cicero while talking to the Skateboard Twins. Cicero is a real suburb of Chicago. In season 2, Jimmy tells his best friend Marco that he can get hot dogs from 'Henry's'. Henry's Hotdogs is also real and is located in Cicero, IL.
Abigail Zoe Lewis took over the role of Mike's granddaughter Kaylee, replacing Kaija Bales from Breaking Bad (2008), because the character is younger in this series. There is debate among fans about Kaylee's age; according to the official wiki page, she was born in 1999 and should be 3 years old in 2002, yet she appears to be 7.
Bob Odenkirk and Julie Ann Emery had previously appeared together in Fargo (2014).
Steven Bauer (Don Eladio) also played drug lords in Traffic (2000) and Scarface (1983).
In season 5, episode 7, 'JMM', according to the characters' driver's licenses: Saul Goodman is 5 cm taller and 1 year and 21 days older than Bob Odenkirk. Kim Wexler is 3.8 cm taller and 5 years, 3 months and 1 day older than Rhea Seehorn.
Michael Mando (Nacho) is originally French-Canadian; he comes from Montréal, Québec, and his native language is French. However, in real life he speaks fluent Spanish; he spent his childhood in many places (he estimates he lived in 35 cities in 10 countries on 4 continents before reaching adulthood) and is therefore multilingual. He speaks French, English, Spanish and Arabic fluently.
Michael McKean appeared in two of Vince Gilligan's side projects: The X-Files (1993) / The Lone Gunmen (2001) and Breaking Bad (2008) / Better Call Saul.
Raymond Cruz (Tuco) and Jonathan Banks (Mike), who appeared in this series and in Breaking Bad (2008), also appeared in a Gremlins film. Raymond Cruz played the messenger in Gremlins 2: The New Batch (1990), and Jonathan Banks played Deputy Brent in Gremlins (1984).
Rhea Seehorn had previously played a lawyer in Franklin & Bash (2011).
Rhea Seehorn was not actually injured during the filming of the season 4 storyline in which Kim's arm is broken. However, she still wore a fully functional arm cast so that the limited movement and lack of dexterity would look more natural in her performance.
Michael Mando and Tony Dalton appeared in the Marvel Cinematic Universe (MCU). Mando played Mac Gargan / Scorpion in Spider-Man: Homecoming (2017), and Dalton played Jack Duquesne / Swordsman in the Hawkeye (2021) miniseries.
It brings together three actors who appeared in Scarface: Mark Margolis (Hector), Steven Bauer (Don Eladio) and Miriam Colon (Hector's mother), who played Tony Montana's mother in Scarface.
Patrick Fabian (Howard Hamlin) and Ed Begley Jr. (Clifford Main) worked together on three episodes of Veronica Mars (2004) as Hank Landry and Cyrus O'Dell respectively.
Michael McKean, who played Chuck McGill, appeared in two episodes of season 6 of The X-Files, titled Dreamland and Dreamland II. Vince Gilligan, the creator of both Breaking Bad and Better Call Saul, was one of the key writers of The X-Files.
Michael McKean appeared alongside Bob Odenkirk in the production Life Is Precious and God and the Bible (1998) (October 26, 1998).
Years before playing Jimmy McGill, Bob Odenkirk played a former porn actor named Gil in Curb Your Enthusiasm (2000).
Jonathan Banks could not reprise the role of Buzz in the final season of Community (2009) because he did not have time due to his commitments to this series. His character in Community was also a former cop.
Patrick Fabian also played a lawyer on Boston Legal.
Jonathan Banks's character works as a parking attendant. In Is Magic Real? (2014), Banks's character is also a parking attendant.
Before Breaking Bad (2008) and Better Call Saul (2015), Mark Margolis had played another character who suffers a stroke in Pi (1998).
Patrick Fabian and Rex Linn appeared together on CSI: Miami (2002).
Steven Bauer and Mark Margolis acted together in the 1983 film Scarface (1983).
The actors who play Lars and Cal Lindholm (the skateboarding brothers) in season 1 are real-life twin brothers: Daniel Spenser Levine and Steven Levine.
Michael McKean and Giancarlo Esposito had previously appeared together in Nothing to Lose 1997.
Michael McKean and Ed Begley Jr.'s ninth collaboration: after Young Doctors in Love (1982), This Is Spinal Tap (1984), Best in Show (2000), Auto Focus (2002), A Mighty Wind (2003), Relative Strangers (2006), For Your Consideration (2006) and Whatever Works (2009).
Rhea Seehorn stated that fake scripts were used in the auditions for the series in order to prevent spoilers. She also recalled that she burst into tears in the street after learning she had won the role.