When Lucifer and Chloe pull up to the Venice Aquarium valet station, Lucifer hands over his keys and is given a valet ticket with the number "666" on it.
The Japanese that Lucifer speaks at the dojo is "Sono teido ka?" In context, it translates to "That's it?" or "Is that all you've got?"
The title is spoken by both God and Lucifer.
Lucifer questions how much of what happened was God's plan, but he doesn't get an answer. God only smirked. Either everything was turning out how God hoped, or God just found it funny Lucifer would ask. Paying in mind that God said that there wasn't any more need for obscuring the truth.