Depicting the novel The Wonderful Wizard of Oz by L. Frank Baum the film stars Judy Garland, Ray Bolger, Jack Haley, Bert Lahr, and Frank Morgan, with Billie Burke, Margaret Hamilton, Charles Grapewin, Clara Blandick and the Singer Midgets as the Munchkins
Initially Oz was going to be filmed as a fantasy film, but MGM felt audiences wouldn't relate and made the amazing, colorful, song and dance filled portion a dream. Casting problems, filming delays, and set problems plagued the MGM set, and post production wasn't much easier, having to compose the backing score and special effects in a limited amount of time.
A fact I didnt know, in the scene where the film goes from the black and white farmhouse into the wonderful world of Oz, it wasn't shot in black and white. It was too expensive and tedious to "stencil print" (hand tinting each scene) so they painted the interior sepia tone, and had a fill in for Dorothy's back wear a sepia toned dress, so when the camera switched to Oz, Garland could step out in her blue dress against the sepia background.
The film grossed approximately $3 million (equal to $47,437,500 today) against production/distribution costs of $2.8 million (equal to $44,275,000 today) in its initial release. It did not show what MGM considered a large profit until a 1949 re-release earned an additional $1.5 million (equal to $13,819,327.73 today).
It wouldnt let me embed, but heres the first 7 minutes of Dark Side of the Moon synced to Oz :)