1.) Never, EVER interrupt someone else’s audition. You’ll walk away looking like a grade A nimrod. It will also pretty much guarantee that you won’t get the part. Furthermore, it’s unlikely that you’ll get asked back for future auditions by that casting agency.
2.) Don’t bring your life problems into the casting office. Reschedule your time if you have to. This is not to say that the people in this industry aren’t compassionate. They’re just at work. And frankly, so are you. Make sure you’re able to perform to your fullest.
3.) Don’t make the casting people uncomfortable. We’ll just leave it at that.
4.) Be prepared when you go into your audition. This is one of those things that should go without saying, but unfortunately it happens all too frequently. This doesn’t have to be too complex. Have your sides, don’t be thinking about a social misstep you made earlier in the week, be friendly, open, conversational, etc.
5.) Don’t criticize the casting person’s reading. If you’re auditioning for a TV show or a movie, you’ll likely be reading with the person running the casting session. You’re here to show YOUR chops, and that’s it!