Discussion about audience and/or certain audience members is common.
"Did you see Chita Rivera's house left?"
"Michael Riedel's in the house tonight!"
"There's a little girl wearing a Belle costume in the front row. Let's invite her backstage after!"
"If this woman doesn't stop unwrapping her candy by the next act, I'm gonna throw her up on stage and take her seat!"
And a personal story, I was once in the crew of a professional production of a musical in the round. We discovered that an audience member on one end of the stage was texting another member on the opposite end. Backstage, all the actors kept talking about ways to make them notice that they were aware of their rudeness. Finally, one of the leading performers (a person who shall remain nameless, but know that this person is a celebrity and could get away with the about-to-be-mentioned stunt) entered her scene by dismissing all lines and blocking, walked dead center stage, said "I will not move from this spot until the house lights are turned up," and after an awkward minute, stomped into the house right audience, asked one of the audience members for their cell phones, took the battery out, kept the battery and returned the phone. She then walked house left and said "would the audience member that was texting please stand up and give me their phone?" Nothing happened for another awkward minute. "I'm waiting." The audience member stood up and handed over the phone. Again, she took the battery out and handed back the phone. She then walked back to center stage and said "for those of you not paying attention, I want to catch you up to speed because something GREAT is about to happen and I want you to know why!" She then proceeded to perform a great monologue a la "Betrayed" in THE PRODUCERS summarizing the events so far while singing snippets from the show. HUGE APPLAUSE. Then she went house left, returned the battery, walked house right, returned the battery, and returned to center stage and said "if anyone feels that their phone conversation is more interesting than what's going on where I'm standing, then please proceed with it and I'm sorry to interrupt you. Otherwise, house lights off and let's move on!" THUNDEROUS APPLAUSE.
"The Spectacle has, indeed, an emotional attraction of its own, but, of all the parts, it is the least artistic, and connected least with the art of poetry. For the power of Tragedy, we may be sure, is felt even apart from representation and actors. Besides, the production of spectacular effects depends more on the art of the stage machinist than on that of the poet."
--Aristotle