Two main actors traded parts!
Ray Bolger was initially cast to play the role of the Tin Man. However, Bolger felt drawn to the Scarecrow more so the two actors would go on to trade parts. If only it was as easy to get your online college degree as it was for Bolger to pick his favorite role.
Bert Lahr made big money as the Cowardly Lion
Lahr racked up nearly $2,500 per week in order to play the part of the Cowardly Lion. His contracted mandated five weeks of pay, at minimum, but filming would take nearly 26 weeks to complete.