PICK-UPS
All right, you're most likely going to have pick-ups (additional shooting after principle photography has been completed) when you first start out making movies. There are a lot of things you don't get the way you want while your shooting.
Be sure to use the Script Girl's notes on pick-ups, so you can match camera lens, aperture, costume, make-up and everything else that'll be noticeable if you don't.
Be sure to include in your contracts with everyone that in case of pick-ups you'll get them to work for free! Even the rental houses, try to get them to commit some sort of package so that you can complete your picture without taking a bath. (I meant that figuratively!)