. . . If you can remember what your mother taught you. Using good judgement and being considerate of others is a good start!
1.) After the audition, don't repeatedly email/call asking if you got the job.
2.) For a submission, submit only if you are appropriate and if you have the skills to do the job. Do not call, again, asking, "What's this all about?" How is this received? We had a recently had a casting for VO talent who spoke German. Casting received 65 replies. 60 of them either couldn't speak German, only sent a link to their demo reel, or they just emailed the line, "I can do it!" and nothing else. Casting Directors are paid to weed out the inappropriate. And they also remember the inappropriate.
3.) Don't be late. Ever. It's disrespectful to the client, director, casting director - everybody who has a say in hiring or passing on you, and it can throw off the casting, especially if people are being paired up. The general statement you are sending is, if you're late to the audition, you'll be late to the shoot. [The biggest sin in this business.]
4.) A brief picture postcard note of thanks after the audition goes a long way. A lot of CDs say this. So why don't you do something that they like and will remember you well for?
5.) When you're finished auditioning and leave the room, leave the studio. Don't hang out chatting in the front with other actors. The show must go on and added bodies and distractions can disrupt the flow of casting, causing you to be looked upon as a nuisance.