Short answers, pulled from the story.
Gone with the Wind had its world premiere on the 15th of December 1939 at the Loew's Grand Theatre in Atlanta, Georgia. Approximately 300,000 people lined the streets for seven miles to watch the procession of limousines carrying the film's stars, and Georgia's governor declared the day a state holiday.
Victor Fleming received sole directing credit for Gone with the Wind, but three directors contributed footage. George Cukor directed eighteen days before being fired, Fleming directed ninety-three days, and Sam Wood directed twenty-four days in May 1939 while Fleming was away due to exhaustion.
Vivien Leigh was cast after a nationwide search that interviewed 1,400 unknown women at a cost of $100,000, plus screen tests of dozens of established actresses. Leigh had been quietly considered since February 1938, when producer David O. Selznick saw her in Fire Over England and A Yank at Oxford. Her casting was announced on the 13th of January 1939 after a Technicolor screen test on the 20th of December 1938.
Gone with the Wind won eight competitive Academy Awards at the 12th Academy Awards, including Best Picture, Best Director for Victor Fleming, Best Actress for Vivien Leigh, Best Supporting Actress for Hattie McDaniel, and Best Adapted Screenplay for Sidney Howard. It also received two honorary awards, setting a record for total wins and nominations at the time.
Hattie McDaniel played Mammy in Gone with the Wind and became the first African American to win an Academy Award when she won Best Supporting Actress at the 12th Academy Awards. Despite the achievement, she was racially segregated from her co-stars at the ceremony and had been prevented from attending the film's Atlanta premiere by Georgia's Jim Crow laws.
Yes, Gone with the Wind is the highest-grossing film in history when adjusted for inflation. Guinness World Records calculated its inflation-adjusted global gross at $3.44 billion in 2014. Across all releases, an estimated 200 million tickets have been sold in the United States and Canada alone.