Transcript:
Morty is addressing the actors.

M: O.K. People! Monday is the day that you’re all supposed to be OFF BOOK.
M: And since I get the pleasure of being ON BOOK for you, I want to remind you of the PROPER way to call for line:
If you say “LINE” I will begin reading your line. If you start talking, I will assume you know the rest of the line and I will stop. Then everyone moves on with their day.
M: DO NOT stand there in silence and expect me to know that you need a line. DO NOT snap your fingers at me instead of saying “line.” DO NOT say “Oh, I’m so sorry What’s my line?” That will needlessly drag out the run and that will make me angry. AND I GET CREATIVE WHEN I’M ANGRY.