People who faint don't keep holding on to a piece of paper, like the mother in close-up, on the chair. Muscles go limp, yet her thumb keeps a tense grasp upon the sheet of paper.
Although they had important speaking parts, none of the students were given credit in the cast.
Jack Webb is evidently pretending to talk when his Friday gesticulates with his hand at the sitting woman and man behind her, as well as in the previous scene, when there was no sound, but a voice-over by himself explaining the goings-on Instead of acting out a scene as Friday, Webb simply moves his lips but remains mute; the actor doesn't speak any words---and it shows.