The fight between Emily and Kumail, when Emily discovers the pictures of Pakistani women in Kumail's room, never happened in real life. The real Emily, however, did recall how tension had arisen between two after Kumail wouldn't introduce her to his family.
The film premiered at the Sundance Film Festival where it was very well received, which started a bidding war between Sony, Focus Features, Amazon, & Netflix for the distribution rights. Co-creator of the film, Kumail Nanjiani wanted the film to have theatrical distribution, which eliminated Netflix from the bidding war because they're not a proponent in that distribution model. The film's distribution rights were eventually bought for around $12 million by Amazon who is a big proponent of the theatrical experience, with all of its films getting at least some kind of theatrical run. The $12 million dollar deal is one of the largest deals in Sundance's history.
The decision to add the real-life photos of Emily and Kumail in the credits was suggested by actress Leslie Mann after seeing an early cut of the film.
The screenplay for The Big Sick is written by Emily V. Gordon and her husband Kumail Nanjiani, and is loosely based on the real-life courtship between them before their marriage in 2007. According to Nanjiani, the idea to make a script about them was first inspired by the film's eventual co-producer Judd Apatow when the two met while appearing in a 2012 episode of the You Made It Weird podcast. Developed over the course of three years, the script has been called semi-autobiographical because, in addition to the two lead characters modeled after them, many of the events occurring during Gordon and Nanjiani's relationship are noted as being portrayed to an extent in the film. Though not part of the original script, a real-life incident involving Holly Hunter heckling an unnamed player during a US Open tennis match inspired a similar scene in the film where Nanjiani's character is heckled during one of his stand-up sets.
While searching for funding, the producers submitted the script to a variety of potential studios. Within three hours of submission, FilmNation made an offer to fund the whole movie, no strings attached.
In the film it's mentioned more than once that Kumail is a fan of the TV series, The X-Files (1993). In reality, Kumail Nanjiani actually appeared in an episode of The X-Files in 2016.
While writing the script, Kumail wanted his on-screen family to reflect the jokey and humorous traits of his real life family. He bemoaned that so many Muslim characters were so frequently depicted as overly serious and aimed to avoid that stereotype.
Kumail Nanjiani personally contacted Anupam Kher about taking the role of his father, Azmat. Kher accepted the role after learning that Kumail's real father personally expressed a desire for him to take the role.
Writer Emily V. Gordon mentioned that her real life parents are quite different than their on screen depiction.
Judd Apatow reached out to Ray Romano for the part of Terry after briefly working with him in the movie Funny People (2009). He was also a huge fan of the sitcom, Everybody Loves Raymond (1996).
Kumail Nanjiani and Adeel Akhtar are the only two actors in their on-screen family of actual Pakistani origin. The rest of the actors (Anupam Kher, Zenobia Shroff and Shenaz Treasury) are all Indian.
Kumail and Emily spent 3 years writing the script. They would frequently receive notes and suggestions from producers Judd Apatow and Barry Mendel.
The line where Terry mentions the game, "Throw the Chalk at Jimmy," was improvised by Ray Romano.
In November 2016, Kumail Nanjiani was a guest on the NPR podcast "Pop Culture Happy Hour." When one of the podcast's hosts, Linda Holmes, invited him to plug his upcoming movie (which at the time was still filming), he said, "my wife and I wrote a movie, and I'm in it, and it's going to come out next year. Right now it's called 'The Big Sick,' but the name's going to change. So just look for the rom-com about a brown man and a white woman, starring me."
Before auditioning, actress Zoe Kazan watched videos of Kumail and Emily to help get a better understanding of them and their characters.
Kumail Nanjiani plays a version of himself in the film, including having the same name. However, his wife, Emily Gordon, has her name changed to Emily Gardner.
Holly Hunter came up with the idea of having her and Zoe Kazan wearing the same necklace to imply the strong mother/daughter bond between the two characters.
Emily and her mother wear the same necklace through most of the film: it's a gold pendant that has a sun on one side and the word "love" engraved on the other side.
In a hospital scene it can be quickly seen Emily's wrist band which says DOB is 5/3. That is the real birthday of Emily V. Gordon - though different years.
Kumail Nanjiani was both excited and nervous about writing the script. Five years had passed since Emily's health scare but the feelings from the experience were still fresh in his mind.
Kumail Nanjiani and Emily V. Gordon had a podcast called The Indoor Kids where they discussed video games. The name refers to a line from Wet Hot American Summer (2001) which director Michael Showalter co-wrote.
Director Michael Showalter commented on the second act's darker though still humorous tone after Emily goes into her coma. He referred to how the movie approaches life stating "No matter how bad a situation gets, you've got to have humor."
Composer Michael Andrews initially incorporated Eastern-style music into his score to help illustrate the film's themes of culture clash and assimilation. This idea was eventually scrapped as Andrews said it "felt forced."
Judd Apatow was attracted to the project because in addition to it being funny, it tackled a variety of topics and themes including relationships, religion, family, and stability.
In a nod to the fact that both the character of Kumail and the real-life Kumail Nanjiani are fans of the television series The X-Files (1993), in this movie, Kumail's cellphone ringtone is the "Theme from The X-Files" by Mark Snow.
While directing the film, Michael Showalter frequently collaborated with the cast and encouraged improvisation.
Rehearsals for the film were nearly delayed when actor Anupam Kher was unable to travel from Bombay to New York due to an issue with his visa. Fortunately, the problem was quickly resolved and production commenced as scheduled.
Kumail's sister-in-law suggests he should be on Saturday Night Live (1975). Aidy Bryant, who plays Mary, is a cast member of 'Saturday Night Live'.
It was shown on the closing night of the 3rd Edition (2017) of "IndieBo" (Bogota's Independent Film Festival) as part of the "In Focus" section.
Kumail Nanjiani had previously worked with director Michael Showalter in the film Hello, My Name Is Doris (2015).