Young actor Dylan O'Brien won the part of 'Mitch Rapp' beating the established senior actors, considering his "college age", and the hope that actor grows as the series progresses. Also 'American Assassin' being a prequel novel, provided the opportunity to start at the very beginning of the character Rapp's, career.

CBS Films also bought the movie rights to "Consent to Kill", the eighth book in chronological order of the Mitch Rapp universe.

Dylan O'Brien's first leading role in a movie, after sustaining serious injuries during production of Maze Runner: The Death Cure (2018).

'American Assassin' is one of fifteen novels by Vince Flynn set in the world of counter-terrorism operative Mitch Rapp. Every single one has been a New York Times best-seller, the three most recent entries have been number one New York Times best-sellers, and the series has sold nearly 20 million copies as of Oct 2015..

Bruce Willis was attached to play the mentor of Mitch Rapp

The lead role was offered to Chris Hemsworth but he passed on the role due to scheduling issues.

Established actors like Gerard Butler, Colin Farrell and Matthew Fox where considered for playing the lead role 'Mitch Rapp'.

American Assassin is the 11th book in Vince Flynn's series, but the first book in chronological order.

Film production needed to start by 2016 or the rights to the film would be reverted to the Vince Flynn Estate.

A first look picture of Dylan O'Brien as 'Mitch Rapp' was released on September 12, 2016.

Principal photography began in London, Rome and Budapest in September 2016.

In the books, Mitch Rapps girlfriend was killed in the Pan Am flight that was blown up by a terrorist over Lockerbie Scotland. The movie seems to show her dying on the beach

Director Antoine Fuqua was originally attached to direct.

Jeffrey Nachmanoff and Edward Zwick was also attached as director when movie was on the production stages, back in 2012.

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