In the beginning of the first act there is much moving about and extra talk on the part of the actors, to hold the crowd while it is settling down, and enable the late-comer to be in his seat before the vital part of the story starts.

If he appears later, he is glared at.

In the motion picture art gallery, on the other hand, the audience is around two hundred, and these are not a unit, and the only crime is to obstruct the line of vision.

The high-school girls can do a moderate amount of giggling without breaking the spell.

There is no spell, in the stage sense, to break.