All you need to know about Slumdog Millionaire

'Slumdog Millionaire' was all set to go straight to DVD after the film's original studio backer, Warner Independent (a division of Warner Brothers), closed down in May 2008. Luckily, the Fox studio's indie film division, Fox Searchlight, picked it up for theatrical release.

During filming, Azza, the Mumbai boy who was cast as Jamal's brother Salim, had his house bulldozed by the city council – a common occurrence in the slums where much of the shoot took place. The crew found him sleeping on a car roof.

The three youngest child leads, who were all cast from the Mumbai slums, are now having their schooling funded by the film's producers. With the promise of a trust fund should they pass their exams at 16.

Anil Kapoor, who plays Prem Kumar, the host of 'Who Wants to be a Millionaire?' in 'Slumdog', donated his fee to Plan India, a child development NGO in Delhi, devoted to raising awareness about child abuse, trafficking, education and rehabilitating deprived children.

Kapoor has starred in almost 100 Bollywood films. The real Indian version of the gameshow, 'Kaun Banega Crorepati', has been presented by two of his fellow Bollywood superstars, Amitabh Bachchan (who also features in 'Slumdog' as young Jamal's celebrity obsession) and Shahrukh Khan. Khan turned down the role of Prem in 'Slumdog' after deciding that the character was too negative.

Director Danny Boyle almost didn't film the now-famous lavatory scene, in which young Jamal crawls through a cesspit to get an autographed photo of his favourite star, because it was too similar to a scene in 'Trainspotting' (1996), in which Ewan McGregor climbs into a loo to retrieve opium suppositories.

Lead actor Dev Patel's 'Slumdog' audition was only his second ever. His first was for Channel 4's teen series 'Skins', where Boyle's teenage daughter Caitlin talent-spotted him for the role of Jamal. Last week, he was nominated for a Bafta for best actor. Not bad going.

Bollywood composer AR Rahman, who wrote the score for 'Slumdog', has worked on British productions before. He composed music for 'Elizabeth: The Golden Age' (2007), and in 2002, he composed the musical 'Bombay Dreams'.

Boyle was slightly uncomfortable with the film's marketing campaign, which features posters of the two leads grinning in a shower of confetti with a quote calling it the "feel-good film of the decade". Considering that the film features poverty, torture and murder, says Boyle, "You can't go in expecting it to be 'Mamma Mia!'"

The budget for 'Slumdog' was the smallest of all the nominees for the Golden Globe 2009 award for Best Picture – Drama, which it won. 'Frost/Nixon' cost $25m, 'The Reader' $33m, 'Revolutionary Road' $35m and 'The Curious Case of Benjamin Button' a whopping $150m, 10 times Slumdog's $15m.

Mercedes-Benz asked for its logo to be removed from any scenes shot in the slums. According to Danny Boyle, the car-maker feared that such an association with a poverty-stricken area would dent its image as a luxury brand.

Two of the film's climactic scenes were shot in the Chhatrapati Shivaji Terminus station, which was formerly Victoria Terminus, and is commonly called Bombay VT station. It is the scene of one of the terrorist attacks that took place in Mumbai on 26 November; a pair of gunmen killed more than 50 people in the passenger hall. Boyle now says he believed "you should never talk about the film in terms of the attacks, because one's an entertainment and the other is a tragedy. But the scene in the station [is one] of unapologetic romantic love... It's utterly naive, and it says love conquers all. And [I'm] proud of that. It's unintentional, obviously. But it was the best thing I could possibly say."

The scene in which Jamal is tortured was meant to be funny, says Boyle. "[It] was written as comedy, which is how I thought I'd directed it. When the scene plays in the West, everybody thinks it's about Guantanamo, but in India torture is accepted as part of the culture, like bribery." Sergeant Srinivas, the police officer, is played by the Indian actor, writer and director Saurabh Shukla.

Simon Beaufoy, who adapted the screenplay for 'Slumdog' from the novel 'Q&A' by Vikas Swarup, made three research trips to India to interview street children. He says he wanted to convey the slums' "sense of this huge amount of fun, laughter, chat, and sense of community". Boyle wasn't interested in directing a script about 'Who Wants to be a Millionaire?' until he heard it had been written by Beaufoy (who also wrote 'The Full Monty').

One of the film's opening scenes is a chase through Mumbai's Dharavi slum – the largest slum in Asia. Boyle says it was based on a 12-minute police chase in the Indian film 'Black Friday', about the 1993 Bombay bombings. One of his other reference points was 'Satya', a 1998 film about the Mumbai underworld, written by Saurabh Shukla (who plays Sergeant Srinivas in Slumdog)

Boyle "fibbed" to his US producers that he wanted to translate about 10 per cent of the dialogue for 'Slumdog' into Hindi, then translated almost a third of the script.

'Slumdog' will be released in India on Friday. The film has not been universally praised by Indians. A debate started by commentators on Bollywood star Amitabh Bachchan's blog included criticism of the film's depiction of India as a "Third World dirty underbelly developing nation".