The 'slumdog' was not entitled to be a 'millionaire'. Call it his destiny or an oversight by the Oscar-front runner team protagonist Jamal is shown winning Rs 250,000 in the film despite giving a wrong answer.

"Slumdog Millionaire" is based on Indian diplomat Vikas Swarup's novel "Q and A" and was adapted into the movie by scriptwriter Simon Beaufoy, who changed some parts of the story to make it fit in the film's narrative.
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The result of it is that Jamal ends up giving a wrong answer to a question with wrong options. Swarup's book refers to "Ankhiya Hari Darshan Ki Pyasi" as the song by saint-poet Surdas. The question for the protagonist in the book is a different one.

The song, "Darshan Do Ghanshyam Nath Mori Ankhiya Pyasi", that features in the movie, is from 1957 film "Narsi Bhagat" which was directed by Devendra Goel.