- Orci, Roberto: It's emotional logic, that's what you're looking for in screenwriting.
- Johnson, Rian: That's very liberating I think, to realize you are creating your own system.
- Orci, Roberto: Why are you telling a time travel story? Well I'm not doing it for the gimmick, I'm doing it to find out whether my dad was a better man than what I thought he was.
- Johnson, Rian: You always sync into the quagmire of time travel logic, it makes absolutely no sense, and there's no reason why the Polaroid version should start disappearing, fading out limb by limb. But its genius because it makes perfect narrative sense.
- Orci, Roberto: For one of the few times ever in one of a big popcorn movie, we actually used the most advanced rules of time travel.
- Johnson, Rian: The golden thing I think is when you can create that operating system and its also, on a deeper level, a portrait of your main character.
- Johnson, Rian: The golden bell we're all looking to ring is when those rules define your main character.
- Kelly, Richard: It's fun to try and use science to create parameters and rules and enough logic so that you can feel like you're giving the audience some, like an operating system.