Sardar Khan's son Perpendicular and his friend Tangent are seen watching "Munnabhai MBBS", a popular Bollywood movie released in 2003 starring actor Sanjay Dutt. Nawazuddin Siddiqui, who plays Faizal Khan Perpendicular's elder brother, played a blink-and-you-miss-him role in the same film when he was an unknown actor.

The slaughter house scenes were actually shot in a slaughter house in Allahabad. The back story of Sultan Qureshi (played by 'Pankaj Tripathi') of a fearsome butcher who at the age of 12 could slaughters and skins 1 buffalo in a single day was developed on actually seeing a boy do it. Similarly, Sultan in the contemporary time scale of the film could cut 60 buffaloes in a day. This too was developed seeing an actual person.

The scene featuring a flooded coal mine (just before Sardar Khan is born) is shot in a real coal mine that was actually dry. Using the sound of water dripping and people wading through water, and actors walking as if struggling to cross water, they created the illusion of flooded mine in the darkly lit shot. There is not a drop of water inside the mine in reality now.

The music composer Sneha Khanwalkar started work on the soundtrack over a year before filming began. She traveled to places such as Trinidad in the West Indies to record Chutney music, a fusion of Caribbean and songs of Bihari migrants that were taken there in 1830s as slaves. "Hunter" is one such song, there were two more "Dumper loading unloading" and "British" that did not make it to the film.

Most of the slaughter house scenes were single shot takes. After every shot, the actor 'Vipin Sharma' (who acted in the role of Ehsaan Qureshi) would come aside and throw up. The AD 'Anubhuti Kashyap' (sister of director Anurag Kashyap) would hold back a crowd of almost 50 by standers, more than half of whom were actual butchers, during the shoot by holding her arms wide. A lot of these butchers actually had knives and choppers hidden in their clothes and would joke among themselves "shall we plunge it stab it this way?" which she could hear, and had to ignore since she had to concentrate in the shoot

Instead of the usual olive leaves to represent the film festivals participated in, the festivals are enclosed in two inverted pistols.

This is Bollywood's first commercial film to feature at the Cannes Film Festival during the Director's Fortnight segment at the festival (2012).

Tigmanshu Dhulia (Played as Ramadhir Singh) is the director of famous movies like :Paan Singh Tomar, 'Saheb,Biwi Aur Gangster', 'Haasil' etc.

In an unusual move for India, the movie was released in two parts, separated by a few months. The script was written to appear as two standalone stories when seen separately, but appear as a single story when seen together. The trailer for part 2 is shown after credits finish rolling in part 1.

Feature director Tigmanshu Dhulia's acting debut.

In August 2008, London's Curzon Theatre, London was playing Mesrine, a French gangster movie directed by Jean-François Richet - Part 1 and Part 2 back to back. Anurag Kashyap took a night flight to London, watched the films and flew back that night. He did not tell anyone for a while as he thought people would think he was stupid to spend Rs 35,000 on watching movies. In June 2016 Anurag Kashyap revealed in an interview that somewhere this film has a role to play in Gangs of Wasseypur releasing in two parts one after another.

Assistant director Sohil Shah died in a freak accident during the shoot of the film in Banaras. He fell with a jeep off a bridge. Sohil hit his ear against a metal rod and suffered an instant hemorrhage.

Piyush Mishra and Tigmanshu Dhulia were given the discretion to decide who, among them, would perform the roles of Nasir and Ramadhir. Mishra chose the role of Nasir and Dhulia portrayed Ramadhir Singh.

Sardar Khan name was suggested by Manoj Bajpayee himself instead of Zeeshan Khan.

Nawazuddin Siddiqui and Vineet Kumar Singh play the role of sons of Richa Chaddha, and Nawazuddin calls her Budhiya (old lady) throughout the movie. Actually the oldest one is the youngest one in reality and the youngest one is the oldest one.. At that time, Richa Chaddha's age was 25, Vineet Kumar's age was 32 and Nawazuddin Siddiqui's was 38

The movie, as decided in pre-production, was to be released in a single part(not in part1 and part2), but no theatre in the county was ready to display a film of over 300 minutes. Hence the idea of two parts came up.

Anurag had also revealed that the 2008 Tamil movie Subramaniapuram was the inspiration for this movie series.

In a pre titles credit, Anurag Kashyap expresses his gratitude to the "Madurai triumvirate" of Bala, Ameer Sultan and M Sasikumar, for inspiring him to get back to his roots.

The character Mohsina played by Huma Qureshi was firstly not in the script and Anurag Kashyap improvised it later.

The film has also been inspired from the story of rivals Shafi Khan and Surya Dev Singh.

In Part 1, there is a scene which shows young Faizal and Fazlu eating an popcicle outside the cinema where there is a little girl who is asking the ticket seller to let her in to watch the movie. In Part 2, Huma Qureshi's character, Mohsina, is also seen asking the ticket seller to let her in.

When first hearing Wasseypur's story, Kashyap found it unreal to believe that mafia activity and gang war existed at such high level.

According to Bajpayee, the role of Sardar Khan is the most negative role he has done till date.

Shooting of film also took place in Chunar.

During filming in Varanasi in December 2010, film's chief assistant director Sohil Shah was killed on shoot while performing one of the stunt shot scene which was an accident.

Gamucha, a thin traditional East Indian towel was taken to Cannes and the whole team danced on the streets wearing red gamchhas, after the Cannes Film Festival and has been making public appearances in them ever since.

Vedesh Sookoo song "I Aint Ride No Bicycle:" was remade into "I am a Hunter".

Canadian Indo Canadian rapper Horse Powar sampled a song from the film for her song "Hi Everybody".

This film made a record by giving so many actors screen time and credits.

Was banned in Kuwait and Qatar.

27] The Movie has been dedicated to Sohil Shah as is seen in the opening titles.

In keeping with the language and setup of the film, wall paintings instead of posters, reading "Goli Nahi Marenge, Keh Ke Lenge - Gangs of Wasseypur" were painted on walls across 20 cities.

The crew promoted a fake electoral campaign through the streets of Mumbai and Delhi to market the second part of the film.

The film's soundtrack is heavily influenced by traditional Indian folk songs.

Centered on the coal mafia (Mafia Raj) of Dhanbad, and the underlying power struggles, politics and vengeance between three crime families.

Was screened at the Sundance Film Festival in January 2013.

Received four nominations, including best film and best director, at the 55th Asia-Pacific Film Festival.

Anurag Kashyap said he had wanted to make a film on Bihar with the name Bihar for some time but for various reasons it didn't take off.

Anurag Kashyap, who co-produced the film with Sunil Bohra, has said that it is his most expensive film and he reportedly had to spend INR 15 crore on paying the actors.

According to Kashyap, to tell the story through a few families is what interested him but that also meant a longer reel. "We all know mafia exists but what they do, how they operate, why they do we don't know and that is something which forms the basis of the film".

Both parts of Gangs of Wasseypur together cost just INR 18.4cr to make.

In another effective way of building the world of Wasseypur for the audience, a fictitious newspaper was made available online which was named Wasseypur Patrika.

The success party for the first part was held at Escobar in Bandra, Mumbai on Thursday, 5 July, late evening.

The character of Faizal Khan is based on Faheem Khan.

There was no character akin to Shahid Khan.

The character of Ramadhir Singh is based on Surajdeo Singh.

As oppose to the film, most of the gang wars were between the gangs of Wasseypur, not with the Singhs, who had been instrumental in instigating these wars, but never participated in them.

Fazloo's character is based on Sabir Alam.

The film received an Adults Only certification from the Indian Censor Board but is still unusually explicit for Indian standards as it contained vulgar lingo and violence generally suppressed by mainstream Indian movies.

Story spans from the early 1940s to the 2000s.

Kashyap met Zeishan Quadri (the writer of Gangs of Wasseypur) in 2008, who told him about Wasseypur's story.

Zeishan Quadri had narrated enough stories to Kashyap, but what really attracted him was not gang war but the entire story of emergence of mafia.

Chadda revealed in an interview that this role helped her bag 11 film roles.

The theme and style is such that the scenes are short in length, several in number and often a series of montages take the story forward.

Kashyap tweeted and revealed that the INR 450 million budget as reported in the media is false.

Qureshi landed this role after director Anurag Kashyap spotted her in a Samsung commercial he was directing.

The film finished production in late March 2011, with Anurag Kashyap moving on to direct his next film immediately due to the accident with Sohil Shah.

Absorbing styles as diverse as those of old-school Italo-American mafia classics a la Coppola, Scorsese and Leone, as well as David Michod's taut crime thriller "Animal Kingdom," Kashyap never lets his influences override the distinct Indian color.

The scene where Durga is charmed by Sardar Khan over her daily chores and the one where Faizal goes on a formal date with Mohsina were considered 'outrageously hilarious'.

Major portions of the film were shot at villages near Bihar.

Kashyap's use of occasional bursts of music and comedy to punctuate the slowly augmenting tension at different junctures is highly reminiscent of Spaghetti Westerns.

Music of the film was launched on 23 May.

While most music launches in India happen with a big party in a 5-star banquet hall in a Delhi or Mumbai, and formal announcements before the press, the music of this film, was launched in Patna.

The two parts have a whopping 25 songs.

The film team made a memento consisting of bullets of different era.

The film's soundtrack is heavily influenced by traditional Indian folk songs tending to be philosophical and liberal with its heavy use of sexual innuendos.

The crew promoted a fake electoral campaign through the streets of Mumbai and Delhi to market the second part of the fil..

Siddiqui and Qureshi made special appearances on the TV serial "Afsar Bitiya" for the promotion of the second part.

For the promotion of second part, in several areas of the Delhi and Mumbai, political posters had been plastered, in which the two opposing contestants from the movie Ramadhir Singh and Faizal Khan, vied for votes.

Kashyap has plans to make another sequel, "Gangs of Wasseypur 1.5" and has incorporated Zeishan Quadri as the director of the third part.

Anurag Kashyap never has to resort to extraneous elements like stylised entries, editing patterns or camera motions to add to the effect because the story has an intrinsic impact of its own.

Kashyap kept unabashed blood, gore and abuse wherever the scene demands.

Bajpai's motivation for doing this role came from the fact that there was "something new" with the character of Sardar Khan.

The movie chronicles the journey of the saga associated with coal mines.

This is Huma Qureshi's first film, and she characterised this as her "dream debut".

Despite its grim theme, the film also has an inherent sense of humour that comes quite naturally to it from its series of events.

Violent as his screenplay is, Kashyap reveals wit while narrating his tale.

The filming style adopted by Anurag Kashyap in bears a striking similarity to the styles of Nurul Hasan Pulak and Sam Peckinpah.

Ample black comedy is used to imagine the gang war milieu.

Kashyap's use of dark humour to judiciously propagate violence bears an uncanny similarity to Quentin Tarantino's style of movie-making.

The film's pacing is machine-gun relentless, sweeping incoherence and repetitiveness under the carpet as it barrels forward with hypnotic speed.

The marketing of the film was noted for its uniqueness.

Anurag Kashyap: [hidden camera] Multiple chase sequences on crowded streets, among ordinary people and not hired extras. Anurag Kashyap uses hidden cameras to capture raw ambiance of the location in many of his movies, such as the slum chase in Black Friday (2004)

Anurag Kashyap: [long take] The first shot contains a long take lasting about 10 minutes, where a group of shooters walk through alley-ways to attack a house.

The movie continues the trend of Anurag Kashyap paying tribute to Quentin Tarantino's directorial style. One particular example is of a person getting shot while the shooter is not in the frame, often unexpectedly. Shahid Khan, the main protagonist of the first third of the movie, gets shot unexpectedly while on Ramadhir's duty. Two generations later, his grandson, Faizal Khan and the protagonist of the last third, gets shot in the same fashion. Sardar Khan, Faizal's father, is the only protagonist not to be killed in this way. Instead in his case, the audience sees all four shooters but never see him actually getting shot. Anurag Kashyap had earlier made use of this effect in his movie Gulaal.

While shooting for the climax,Nawazuddin remembered a childhood incident to bring more reality in his character.Near his Uncle's house,a women was killed brutally by her Husband and was chopped in pieces. Nawaz tried to follow the psychological trauma of the husband.

Manoj Bajpai(Sardar Khan) was roughly killed in the same way in shoot-out at Wadala as he was killed in gangs of Wasseypur and on the same location (petrol pump).

Sardar Khan's death scene is same as Sonny Corleone's death in The Godfather. The main similarities are: The shooting was unexpected, the workers did not help, the target came out of the car still having some breaths. The differences are: Sardar ducked to dodge the bullets and Sonny was shot continuously even when he got out of the car.

In the film, Sardar Khan marries the Bengali girl but in reality, the woman was maintained as a keep.

Another scene in the movie, where a Muslim girl is kidnapped by Singh's men, has been portrayed conversely. In real life, the victim was a local Hindu girl and the kidnappers were a few goons from Wasseypur. Members of the Singh family threatened all Wasseypur residents with retaliation if the girl was not returned within 24 hours. The girl was eventually returned as the Singhs were regarded with fear in Wasseypur.

In the film, Fazloo is killed and dismembered by Faizal Khan. In real life, Sabir Alam and Faheem Khan were childhood friends turned enemies. Sabir was awarded life sentence in 2007 for the murder of Faheem Khan's mother and aunt, is out on bail in Wasseypur.

In reality, the mafia's downfall in Dhanbad didn't come from gang wars but rather it came from the differences between Kunti Singh, the widow of Surajdeo Singh, and his three brothers - Baccha Singh, Rajan Singh and Ram Dhani Singh - which gave others an opportunity to make space for themselves.

In the film's climax, Singh is brutally killed by Faizal but in real life, Singh died of natural causes in June 1991.

There are several differences in the film which contradict actual documented events most notability the character of Faizal Khan who dies in the climax.