Film is such a bizarre vehicle for acting. It's such a bizarre experience. I don't think you ever really get familiar with it. If you do get familiar with it, you're probably not that good anymore.
For 13 to be unlucky would require there to be some kind of cosmic intelligence that counts things that humans count and that also makes certain things happen on certain dates or in certain places according to whether the number 13 'is involved' or not (whatever 'is involved' might mean).