3 Things Actors Should Never To Do 

During an Audition

#1. Never NOT be off-book if you have received the script sides in advance.  This means if you are an an Actor, and you were fortunate enough to receive any lines from any given scene from the script of a play or a film before the audition, be sure you are prepared by being most familiar with the character you are reading for or having the lines memorized.

#2. Never NOT maintain a superb awareness of your surroundings.  In other words, DO NOT just be focused on your lines.  Remember, Acting is reacting.  Usually during an audition, the opposite lines will be read by a Casting Director or a designated reader during the audition.  Once you've determined the person that will be reading with you, make sure you are reacting naturally as he or she is speaking, as if you are in a real conversation.  Hence, again, that's why it's important to be prepared.  If you're prepared, your brain should already be familiar with YOUR lines!  Half the battle is over! The only thing that should be in your favor for concentration and focus is the attention you provide to the opposite reader's lines as they are being delivered.

#3. Never say you're sorry.  If you are in the middle of a scene and you happen to accidentally stumble on a word, forget a line, stutter, or get overshadowed by nervousness, DO NOT say you're sorry. Just keep going until the end. Saying sorry tends to project a lack of confidence and reassurance for getting the part.  Confidence is extremely important, as the acting business contains countless amounts of competition. Even the slightest bit of doubt from Casting Directors will have them saying "Have a nice day." faster than you can blink.  To overlook this flaw, repetition makes practice makes perfect!