Grammatical and spelling errors can set the tone for a character and lend a mood to the world a character inhabits…when done with specificity and attention to detail.
Anything else makes me question a writer’s competence and a production’s credibility and thus, in turn, makes me want to run in the opposite direction.
Professional actors work hard and want to respect and honor a writer’s words and intentions down to the last comma, ellipsis and em dash. This is especially true when there are plenty of writers who write in a very tight fashion as opposed to those who straddle more on the loose side with their writing.
In keeping with these thoughts, a writer is more apt at seeing character work being presented that is closer to his or her vision. Thus, it would be in the writer’s best interest to have a keen eye when approaching the blank page.
Adieu and Godspeed!