What was one of the significant changes that occurred by 1920 regarding contracts?

The significant change regarding contracts by 1920 was the inclusion of stage managers. This reflects the evolving complexity of theatrical productions during that time, as the role of the stage manager became essential in organizing performances and overseeing all aspects of production. By formally including stage managers in contracts, the industry began to recognize the importance of these individuals in ensuring smooth performances and effective communication among the cast and crew.

This evolution in contracts indicates a broader shift in the entertainment industry where various roles were acknowledged, leading to more structured and professional approaches in managing productions. It helped establish clear responsibilities and rights for all involved, thereby contributing to a more organized theatrical and entertainment environment. Other aspects, like higher pay for performers or the inclusion of recording artists, may have developed later as the industry continued to change, but the recognition of stage managers was pivotal by 1920.