Straight from the horses mouth. Why did some actors have to do dozens and dozens of takes? As he hints here, it’s maybe because they didn’t study their lines in the evenings and get plenty of sleep so they were ready.

Instead, he did a very practical thing – he made them think about the lines by working them out on-stage in take after take until they did what they should have done in preparation. It’s a subtle but very effective way of making them want to do more work on their lines because they’re standing there in front of the whole crew and wasting their time too.