Olivier Schneider, the actor who played Smith (the assassin with the glasses), was also a Stunt Coordinator for this film. He was also the Stunt Coordinator for Taken (2008), which also starred Liam Neeson.

According to his passport, Martin Harris was born on June 7. Liam Neeson's birthday is June 7.

The first of four collaborations between actor Liam Neeson and director Jaume Collett-Serra. They would reunite for Non-Stop (2014), Run All Night (2015) and The Commuter (2018).

The film takes place in November 2011, nine months after it was released in most markets.

On the close-up of the Canadian passports, the surname is where the other names should be, and vice-versa.

This movie reunites Liam Neeson and Aidan Quinn after The Mission (1986) and Michael Collins (1996).

If Bruno Ganz ("Jurgen") looks vaguely familiar, it is because of his stunningly convincing portrayal of Adolf Hitler in Downfall (2004).

Takes inspiration from/shares plot points with two original Twilight Zone (1959) episodes: "Person or Persons Unknown" and "To Serve Man". In the first, Martin, like Dave Gurney, recognizes everyone but no one knows him. There is even a picture with him and his wife thst changes. In the second, a new, inexpensive, easy-to-produce type of corn is created and given free to the masses of various countries.

The poster shows Martin holding a gun. During the finished film, he never once holds one.

An unrelated movie with the same title, was released five years prior to this film. It dealt with several main characters who have amnesia, and are being chased by assassins, much as Martin Harris is, in this film. One of the sympathetic amnesiacs of that film, is later shocked and saddened to learn that he is, in fact, one of the leaders of the evil conspiracy, which Martin Harris also learns in this film.

Martin kills one person in the film, while Gina kills three--two at the same time.

The plant developed by Professor Leo Bressler is called Zea saccharum.

While Jurgen does not use a gun, he shares one thing with Adolf Hitler (both of whom were played by Bruno Ganz ) in that they both took cyanide.