Authors:
  • Mark and jay Duplass really like to improvise. Even if we beg them to go back to the script, they invariably ask us to go "off the rails," as they like to call it. It's just the way they work. You get a full written script. And it's really, really, really good, so that's why it's kind of peculiar that they always want you to improvise, because if I wrote something that good, I would want everyone to stick to the dialogue that was written.

    Source: www.avclub.com