Sara Ryan is smarter than me. She's written several graphic novels, including Bad Houses , and also has this handy blog up where among other things, she writes about writing.

A while back she did a series of blogs where she talked to different artists about the things they hate seeing in a script. Artists are your friends. They make you look good, often better than you are, case in point make them happy, not mad. So check this out and make sure this stuff isn't in your script before you send it off.