Charlie Cox signed on after reading the first two scripts, calling them the best he'd ever read.
In April 2015, Elden Henson spoke of his excitement for Foggy's role in the series, saying:
"I was really excited as I was getting the scripts and reading that Foggy wasn't just a useless sidekick. He's not just comic relief. I mean, he is some of those things. He does have comic relief, but it was exciting to know that these other characters would have their own path and their own things that they're dealing with."
Toby Leonard Moore described James Wesley as an "interesting character to play, because in one moment he can be incredibly charming, and in the next, dastardly as all hell, manipulative and Machiavellian, but always loyal to Wilson Fisk.
Amy Rutberg described Marci Stahl as a woman who "is trying to hustle in a man's world and I can appreciate that. She is the hardest working person in the room and doesn't apologize for who she is and what she likes."
Sorta. The show was filmed in New York City, where it's set. However, the real Hell's Kitchen has regentrified significantly, whereas the events of The Avengers are said to have driven down property values in MCU Hell's Kitchen. Thus, the show was filmed in portions of Brooklyn neighborhoods like Williamsburg and Greenpoint that somewhat resemble 1990s Hell's Kitchen.
Frank Castles trial takes place, both on the exterior and the interior, at the Bronx County Courthouse.
In "Condemned", Matt hides out with Vladimir from the corrupt cops in an abandoned building. The series is telling us that this warehouse outside which Blake gets shot is somewhere in Hells Kitchen, however this is actually 270 Meserole Street in Bushwick. Tarp is placed all over the building to cover up the street art that is all over the outside of Exit Room NY, a former brewery turned cultural space.
Wilson Fisk's "coming out" press conference is on the steps of Brooklyn Borough Hall.
Wilson Fisk's attempted escape from custody begins with the ambush, which unfolds on the Honeywell Bridge in Long Island City.
The scene where Reyes attempts to sacrifice Grotto as bait for the Punisher takes place at the Getty Fuel Terminal in Greenpoint. This is a super popular film location that comes up in nearly every crime show in New York City, and theres even a film studio on the property called Broadway Stages. However, the rooftop where Frank chains Matt up is not in Greenpoint. It's actually at 43rd Avenue and 22nd Street in Queens. It's also where the final battle scene between Matt, Elektra and the Hand take place. In the final episode, when the hostages are taken out of the building, an alley that runs east west between 21st and 22nd Street is used for the filming. That rooftop also was used in Jessica Jones (2015).
The town of Windham, New York, located in the Catskill Mountains about 140 miles north of Manhattan, was used in season 3 to represent Karen's hometown of Fagan Corners, Vermont.
Creator Backlash: A few years after the show ended, Nobu's actor Peter Shinkoda accused Jeph Loeb of preventing the Hand as being portrayed as anything more than generic Yellow Peril villains, even saying in an early writers' meeting "No one cares about Asian characters." Shinkoda also claims that he was forced to pay travel costs out of his own pocket for last-minute reshoots (several of which would end up being canceled later), had all his requests for reimbursement denied, and was threatened to be replaced with "another Asian" if he refused. As a result, despite the show's massive success, Shinkoda actually lost money for being in Daredevil. This fits quite nicely with other accusations that have popped up that Netflix so abruptly cut ties with the whole franchise because Loeb was so hard to work with.
Dawson Casting: A minor case in that Foggy, Matt, and Marci were all college classmates and should be the same age. In reality, Elden Henson is a full five years older than Charlie Cox and four years older than Amy Rutberg.
With Arrow. Aside from this simply being the case because both shows are based on characters published by long standing rivals Marvel & DC Comics, both shows are grittier takes on comic book vigilantes rather than superheroes.
With Constantine, another DC property. Both shows are second (and more successful) attempts at adapting an anti-hero to series after a mediocre movie in the 2000s. Though this one had a respectable run with Constantine crashing and burning after one season.
Charlie Cox works out to gain significant muscle mass for when the show is in production. He also shaves his Carpet of Virility for shirtless scenes (you can occasionally see it creeping up from his collar when he's wearing a shirt). Not as noticeable, but his naturally brown hair is tinted a reddish copper for the show.
Elektra Natchios is a very complicated case. In the comics, she's just a Greek. Finding a native Greek actress who's also skilled at martial arts is pretty difficult, so instead the producers picked Élodie Yung, whose father is Chinese-Cambodian, while her mother is French with a mixed Italian heritage. Elektra is implied to be Asian by her character (and actress's) background, and was adopted by Greek parents.
Japanese Nobu is portrayed by Japanese-Canadian Peter Shinkoda.
For those who understood the "Get Maggie, he's awake" line and the staging of the last shot in The Defenders of Matt on a bed in a convent, it was no surprise when it was announced that Matt's mom would appear in season 3.
Many called Marci's return in season 3 well before any casting announcement, given Amy Rutberg going on spoiler lockdown and dropping not-so-subtle hints about it.
There were a number of fans who predicted Wilson Bethel would be playing Bullseye well before it was officially announced, mainly based off of how he was initially announced as being cast as "FBI Agent #2".
Jossed: In its very first scene, Season 3 nixes the popular theory that Elektra brought Matt to the church at the end of The Defenders.
Out of Order: In season 1, the second episode was shot before the first episode. This was to accommodate Deborah Ann Woll as she wrapped her filming on the last season of True Blood.note As Deborah Ann Woll put it, she basically went straight from filming the Thanksgiving dinner end scene of True Blood to New York and her first scene as Karen was the scene where Farnum tries to kill her in her cell. This somewhat explains why Foggy and Karen's subplot in the episode is completely disconnected from what Matt is doing.
Reality Subtext: Karen begins dating Matt in season 2. Deborah Ann Woll's real boyfriend EJ Scott is blind, having lost his sight to Choroideremia, and she raises awareness for the disease. Scott actually dressed as Matt Murdock for the premiere.
Revival by Commercialization: While "Kangding Qingge" is by no means obscure in China, this show probably helped popularize it among Western audiences.note It's the song Madame Gao's runner is singing in the taxi right before he gets shot
Schedule Slip: Due to the way the Netflix shows' production schedules are arranged, and all the shows basically having to be halted to allow for production of The Defenders (2017), there was a 2 year 7 month gap between season 2 (March 18, 2016) and season 3 (October 19, 2018). This worked out quite well as it allowed the franchise to check in with how all the other Defenders were dealing with Matt's supposed death before getting back to him.
Separated-at-Birth Casting: Peter Halpin, who plays Foggy's brother Theo in season 3, was cast because he has a very strong resemblance to Elden Henson. Moreso when you compare photos of season 1 or season 2 Foggy to photos of Theo.
Stunt Double: Chris Brewster was a stunt double for Charlie Cox and Aidan Kennedy and Devin Sanchez were stunt doubles for Skylar Gaertner in the role of Daredevil.
Throw It In!: A rather amusing case: During the graveyard scene between Matt and Frank in season 2, one of the most notable aspects is that you can see Matt crying at Frank's story. The popular story is that Charlie Cox indeed starting crying on set despite it not being in the script, and it worked so well that it was left in the script. The truth is...less glamorous. Charlie was actually sweating his ass off in the suit and the sweat beads on his face looked like tears, which indeed were decided to work with the scene, and were left in.
In general, the suit is a sweatbox. You can see this very much in season 3 from the amount of sweat in Dex's hair whenever he unmasks.
Cox has talked in interviews about working with Oleson to ensure that Matt comes off as humbled by the first two seasons and The Defenders and thus is slightly different from the Matt we've had in the past.
Woll has talked about how she worked with Oleson to make Karen's past something difficult for her to endure and one that avoids the misogynistic and sexualized violence that Karen suffers from in the comics, especially the "Born Again" arc, which is reportedly an arc that Woll is not a fan of despite being one of the more iconic comics stories.note She actually got a promise from the creative team before even taking the role that this version of Karen wouldn't be selling out Matt's identity for a heroin fix. In one interview on the Punisher marketing circuit, done right before she began filming for Daredevil season 3, she said, "if we ever do delve into Karens past, please dont make it that she shot someone while saving a busload of children. You know? I wanted to encourage him to make this difficult, make it something hard for her to get over, and so we can hopefully pull off something pretty interesting. I like the idea of compromising the character in some way, but I just don't know that it has to be sexual, or that it has to be in a way that causes her to lose her strength."
Word of Deborah Ann Woll is that the flashback to Karen's past in season 3 takes place when Karen was 19, and that eleven years passed between when she left Vermont and when we meet her at the start of season 1.
It was Charlie Cox's idea for the first episode of season 3 to have a flashback showing the rest of Matt and Karen's identity reveal conversation. He and Deborah Ann Woll also fought for the scene to be kept in the story.