After reading several folks response, I want to modify my original statement about stage managers being seen and not heard. I meant to state that yes, you *should* point out anything that could cause physical harm to the actors, impossibilities due to scenic elements, etc. However-I've worked with primarily young and inexperienced ASM's who would pipe up when the director was asking the actors questions, or answer a question that was directed to the SM. I've found most directors don't want suggestions, but are open to you saying, "Just so you know, there's a low hanging part of the awning there, so they shouldn't stand there." Hope that helps. I realize that it's important to point out potential problems, but many young SM's don't know their place in what to say and what to be quiet about.