Last minute cast changes abound in silent films and early talkies. Sometimes promotional material for a film was already printed up before a release and studios did not want to expend the money to reprint promotional artwork for one cast member change.
In silent films and early talkies, cast changes frequently happen at the last minute. Frequently, promotional material for a film had been printed prior to its release, and studios decided not to incur the expense of updating the artwork for just one casting change.