MGM put all of their eggs in one basket for this film
When production wrapped on The Wizard of Oz MGM would have spent almost $3 million on the film. This was easily the most money MGM had ever spent on a project. Times have surely changed.
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The Cowardly Lion costume was heavy
In order to wear the lion costume, which was made of real pelts by the way, the actor would have to carry 100lbs right on his shoulders all day. What a heavy costume!