1. Ed Harris talking to Truman on the outskirts of "the world" as if he was the voice of God himself.
2. The idea that it's better to live in ignorance than to know the full truth of what one is experiencing. Truman's innate curiosity as Human couldn't be quenched by dogma. Every time he came up against an external barrier discouraging him not to know the truth, he ignores them and finally walks through the door into the real world.