- Actor-Shared Background: When Ethan Hawke looks at his watch (at around 8 mins), his real birthday is shown.
- Blooper: When the agent shoots his future self, he is using a 6 shooter, but 7 shots are fired total.
- Actors: The short story doesn't have an event of John's face being burnt and reconstructed to look like the Barkeep. Barkeep is merely an older version of John. The movie, being visual, had to introduce that face change else it would have given away the plot
Trivia / Predestination