1. The famous “burning of Atlanta” scene in Gone with the Wind (1939) consisted of burning the old sets from King Kong (1933), The Last of the Mohicans (1936), and Little Lord Fauntleroy (1936).
2. The scene in which Judy Garland sings “Over the Rainbow” in The Wizard of Oz (1939) was almost cut from the movie. Assistant producer Arthur Freed is credited with convincing MBM exec Louis B. Mayer to kept the scene.
3. There were 124 midgets hired to play munchkins in The Wizard of Oz (1939). One midget fell into a studio toilet and was trapped there until somebody finally found him.
4. When Clark Gable was filmed sans undershirt in It Happened One Night (1934), wives all over the country stopped buying their spouses the undergarment, causing a depression in undershirts in the 1930s.
5. The most expensive black-and-white movie ever made was Who’s Afraid of Virginia Woolf (1966). Production costs totaled $7.5 million, due in large part to the salaries of its stars, Liz Taylor and Richard Burton.
6. The largest number of fatalities ever in a production of a film occurred during the shooting of the 1931 film Viking. Twenty-seven people died, including the director and cinematographer, when a ship they were shooting from exploded in the ice off the coast of Newfoundland.
7. The most extensive screen tests in the history of motion pictures were held for the role of Scarlet O’Hara in Gone with the Wind. MGM shot 149,000 feet of black-and-white test film and another 13,000 feet of color film with 60 actresses.
8. The largest cast of living creatures in a Hollywood film were the 22 million bees employed by Irwin Allen in The Swarm (1978).
9. The longest take in a movie is in Andy Warhol’s Blue Movie (1996), which consists of a 35-minute uninterrupted scene of Viva and Louis Waldon making love.
10. The greatest number of takes for one scene in a film is 324 in Charlie Chaplin’s 1931 City Lights.
11. The largest make-up budget was $1million for Planet of the Apes (1968), which represented nearly 17% of the total production cost.
12. The largest Hollywood film set ever built was the 1312' x 754' Roman Forum for the Hollywood epic The Fall of the Roman Empire (1964).
13. The largest indoor set was the UFO landing site built for the climax of Steven Spielberg’s Close Encounters of the Third Kind (1977).
14. The smallest set for the entire action of a movie in terms of confined acting space was the lifeboat in Alfred Hitchcock’s Lifeboat (1944).
15. The first film studio in the world was Thomas Edison’s “Black Maria,” a frame building covered in black roofing paper built at the Edison Laboratories in New Jersey. It cost $637.67 to build in 1893.
16. The first Hollywood stunt man was ex-U.S. cavalryman Frank Hanaway who was cast in The Great Train Robbery (1903) for his ability to fall off a horse without hurting himself.
17. The first Hollywood stunt woman was Helen Gibson who doubled for Helen Holmes in the first 26 episodes of The Hazards of Helen (1914). She was trained as a trick rider and married to cowboy star Hoot Gibson.
18. The last wholly silent film produced for general distribution was George Melford’s The Poor Millionaire (1930) with Richard Talmadge (who played the hero and the villain) and Constance Howard.
19. According to BodyCounts.com (which counts only onscreen killings, not characters killed in planet explosions), the movie with the largest body count are The Lord of the Rings: Return of the King (2003) 836, Kingdom of Heaven (2005) 619, 300 (2007) 600, Troy (2004) 572, and The Last Samurai (2003) 558.
20. The first film to receive an X rating under the Motion Picture Association of America system of classification was the anti-establishment Greetings (1968) with Robert de Niro, though it later received an R.
21. The Muppet Movie (1979) was cut by New Zealand Censors on grounds of gratuitous violence. Sweden banned E.T. (1982) for children under 11 because it claimed the film showed parents being hostile to their children.
22. During the “chest bursting” scene in Alien (1986), director Ridley Scott had the actors unexpectedly showered with actual entrails bought from a nearby butcher shop so that their screams of horror would be real.
23. Landmark movies Bonnie & Clyde (1967), The Graduate (1967), and Easy Rider (1969) signaled a shift from “Classic Hollywood” movies to “New Hollywood” or “Post-Classical Hollywood” films because they broke several social taboos and traditional filming techniques.
24. Some of the most infamous Hollywood film “curses,” in which cast members and crew are beset by tragic coincidences, are usually associated with horror movies such as Rosemary’s Baby, The Poltergeist, The Exorcist, and The Omen.

These facts were found using the link below.
http://facts.randomhistory.com/random-facts-about-hollywood-movies.html