Which movie was originally declared the winner for Best Picture?

The winners were announced during the awards ceremony on February 26, 2017.[17] Moonlight became the first film with an all-black cast and the first LGBT-themed film to win Best Picture.[18][19] In an event unprecedented in the history of the Oscars, La La Land was incorrectly announced as the Best Picture, and, a few minutes later, the error was corrected and Moonlight was declared the winner.[20] O.J.: Made in America, at 467 minutes, became the longest film to win an Academy Award, surpassing the 431-minute long War and Peace, which won the Academy Award for Best Foreign Language Film in 1969.[21] Following the five-part documentary's win, new academy rules barred any "multi-part or limited series" from being eligible for documentary categories.[22] With Casey Affleck winning the Oscar for Best Actor, he and his older brother, Ben Affleck, became the 16th pair of siblings to win Academy Awards.[23] Mahershala Ali became the first Muslim actor to win an Oscar.[24] Viola Davis became the first black person to achieve the Triple Crown of Acting with her Oscar, Emmy, and Tony wins.[25]

La La Land was originally declared the winner for Best Picture