When asked about the possibility of a sequel to this movie, star Chris Pine replied: "No. I don't think it made enough money for that to happen. That's one of my deep regrets, that we didn't totally get that right."
After having played British, German, Australian, Swedish, Danish, and American characters in his career, this was the first time that Sir Kenneth Branagh played a Russian character. Branagh originally did not wish to portray the character and agreed to do so only if he was allowed to direct the film.
The original screenplay written by Adam Cozad was titled "Dubai" and was intended to be an action movie starring Eric Bana. Paramount Pictures later asked Cozad to re-write his old script and to change the lead character to Jack Ryan.
The painting in Cherevin's office is Bogdan Willewalde's "Czar's Guard Captures 4th Line Regiment's Standard at Austerlitz". The Battle of Austerlitz was a victory for Napoleon, and the engagement depicted in the painting was the only major Allied success in the battle. Ryan later alludes to the painting and wrongly connects it to the Battle of Waterloo, where Napoleon used cannon fire to distract attention from his attack. Unlike Austerlitz, Waterloo ended in Napoleon's defeat.
In the scene where Jack (Chris Pine) and Cathy (Keira Knightley) are talking in their living room, there is a pillow on the sofa that has an eye chart on it. In the books, Cathy Ryan is an ophthalmic (eye) surgeon.
The original screenplay entitled "Dubai" was featured in the 2007 Blacklist, a list of the "most liked" unmade scripts of the year. The studio purchased the unmade script. They instructed the screenwriter to change the lead character to Jack Ryan and to change the setting to Moscow.
in the movie, Jack Ryan witnesses the fall of the Twin Towers in September 2001 which contradicts the time-line of the previous movies. This is likely due to the fact that original screenplay for this film neither featured Jack Ryan as the protagonist nor was set in the Tom Clancy universe.
There were plans to build a cinematic universe of sorts with Thomas Harper (Kevin Costner) bridging a series between Chris Pine's Jack Ryan and John Clark, another character created by Tom Clancy, and the main character in some of Clancy's books. Paramount Pictures had been courting Tom Hardy, who co-starred in This Means War (2012), another spy-themed movie alongside Pine, as Clark. Due to the box-office performance of this movie, Paramount Pictures abandoned the plan.
The book version of Jack Ryan holds a doctorate degree (PhD) in History, and his undergraduate degree (Bachelor's) is in Economics. In this movie version of Ryan, it is stated that he is working on his doctorate in Economics, rather than History.