* DoingItForTheArt: In ''The Bourne Legacy'', Jeremy Renner actually entered glacier water with little protection.
* FakeAmerican: Brian Cox (Ward Abbot) is Scottish.
* FakeRussian : Russian FSB agent Kirill in ''The Bourne Supremacy'' is portrayed by New Zealand actor Karl Urban.
* InMemoriam: ''The Bourne Identity'' is dedicated to Robert Ludlum, creator of the Bourne series, and Claire Hammond, a colleague of director Creator/DougLiman.
* SleeperHit: The first film. It had tested horribly and Universal delayed it for a year to do reshoots. When it opened, it was expected to die a quick death against ''Film/ScoobyDoo'' and ''Film/{{Windtalkers}}''. However, reviews and word-of-mouth turned out to be quite positive and it managed to gross over $100 million at the box office.
* StarMakingRole: Creator/MattDamon has mentioned that despite getting wildly critical acclaim for previous movies, it wasn't until he proved to have Box Office clout that film offers really started to show up.
* UnderageCasting:
** Julia Stiles played Nicky Parsons, one of Jason Bourne's field handlers on an extremely sensitive mission and apparently has beyond Top Secret clearance given what she is involved in (monitoring all of the Treadstone field agents). In other words, significantly more dangerous to the Agency than Bourne is if she screws up, or if something was missed in her vetting and she is less than 100% loyal. When ''The Bourne Identity'' was released, Stiles was a very young looking ''21''. There's an attempted HandWave in ''The Bourne Supremacy'' when Nicky explains her cover was an exchange student studying in Paris.
** In ''Jason Bourne'', unless Alicia Vikander's character is older than she is, the audience is being forced to believe that a 27-year-old could have a high-ranking position in the CIA. Her demands at the end of the film to be put in an even higher ranked position highlight this.
* WhatCouldHaveBeen:
** Creator/BradPitt turned down the role of Jason Bourne.
** Creator/CliveOwen was the sniper assassin towards the end of the first movie. In the lead up to ''Film/CasinoRoyale2006'' he was one of the people in the running for the role of Film/JamesBond, which would have made this movie just a little funnier in hindsight. Still, you can always imagine it was either [[Film/ShootEmUp Smith]] or [[Film/TheInternational Salinger]].
** The original draft of the first film [[http://gulfnews.com/life-style/celebrity/hollywood/julia-stiles-gave-up-her-adult-life-to-jason-bourne-1.1871485 would have seen Nicky die]] by having her thrown against a wall and breaking her neck. The scene was recut to have her live so that she could appear in a sequel, which she did.

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