- Acting for Two: Michael Fassbender plays both Callum Lynch and his ancestor, Aguilar de Nerha.
- All-Star Cast: Features Michael Fassbender, Marion Cotillard, Jeremy Irons, Brendan Gleeson, Essie Davis and, for Spain, Javier Gutiérrez.
- Approval of God: The leading creatives of Assassin's Creed at Ubisoft loved the film's production design and have said that they will try to incorporate the film's version of the Animus into future games of the franchise (though two games have been released since, Origins and Odyssey, and none of them features that Animus design).
- Box Office Bomb: Like the other major video game movie release of 2016, WarCraft, the film didn't fare well in the US, having a $125 million budget and grossing about $54 million (releasing the week after Rogue One probably did most of the damage). It fared much better internationally, with global gross reaching $240 million.
- The Cast Showoff: The guy who plays Ojeda, Hovik Keuchkerian, is a former Spanish champion in both boxing and Kickboxing, and he gets appropriately to give a couple punches to Fassbender's character in fight scenes. He also said in an interview that he found the filmic style of swordfighting very similar to the movements done in boxing.
- The Danza: Michelle H. Lin as the Assassin Lin.
- Deleted Role: Among the Assassin descendants in Abstergo headquarters there was originally a young girl named Lara (played by Octavia-Selena Alexandru) who inherited memories from Maria, implying the latter survived to the capture of Granada and left descendance in that version of the script. Her entire subplot was edited out very late in development, but her scenes are included in the home release of the movie.
- Doing It for the Art:
- The props department went through the trouble of creating working Hidden Blades that could extend and retract on camera because they felt that it was important to be as true to the mythos and setting as possible rather than simply relying on computer animation to get the desired effect.
- There's the fact that all the sequences set in Spain are spoken entirely in Spanish (albeit mostly modern Spanish, not the ancient variation spoken at the time).
- The Leap of Faith, rather than being done with CGI, was done for real by Michael Fassbender's stunt double Damien Walters, specifically to avoid Special Effect Failure. At 125 feet, it's one of the longest freefalls ever done by a stuntman.
- Dyeing for Your Art: Michael Fassbender trained for six months in order to attain the muscular physique of a character used to running and jumping off rooftops and fighting dozens of mooks at once.
- Fake Nationality:
- Production Posse: This would be the second time director Justin Kurzel works with Michael Fassbender and Marion Cotillard—since their first outing in the 2015 adaptation of Macbeth. Also, Justin Kurzel's older brother Jed composes all of his films' soundtracks since Snowtown (2011).
- Saved from Development Hell: The film was first announced in 2011, but although Michael Fassbender was attached to the project in 2012, it wasn't until 2013 that a writer became attached to the project and work began on the script. Certain announcements made it appear as if filming was to begin in 2014 and a director, Justin Kurzel, was finally hired. However, further delays meant that principal photography didn't start until a year later in August 2015. Teaser images then began being slowly released◊. Luckily, actual production went smoothly, with principal photography wrapping in January 2016 and a firm December 21, 2016 release date in place.
- Stillborn Franchise: The chances to see a movie sequel, which were already meager due to its cost vs box office results, decreased dramatically when Disney execs axed most of the 20th Century Fox movie development slate in August 2019, including the sequel project.
- What Could Have Been:
- Sony Pictures was originally going to produce and distribute the film, but the deal with Ubisoft broke apart in 2012 because Ubisoft wanted to maintain absolute creative control and Sony was unwilling to do so with such an expensive project. New Regency stepped in to produce while Fox took over distribution.
- The first cut of the movie included a subplot in which Callum would meet a spunky teenaged descendant of Maria named Lara, which implies Maria survived to the battle against Torquemada in this version. Lara would be shown to have a mother-daughter relationship with Sophia, as well as somewhat of an oracular role by predicting events via paper fortune teller, and would be vaguely implied to be Callum's daughter or relative. She would ultimately betray Sophia to escape with Callum and the rest, even appearing in the final scene with the other three Assassins jumping down the roof. All those scenes were filmed, with Octavia-Selena Alexandru playing her, but they were ultimately cut from the final product because it was considered she complicated things too much.
- Callum was going to be the sole survivor of the Abstergo revolt, but test audiences found the ending too dark, and it was changed to one in which five of the Assassins survived, including Nathan and Lara. After many other changes, this was trimmed down to just three, with Nathan being killed in the battle and Lara edited out of the film. (Also, a version of the ending had Callum seeing a ghostly image of his mother a last time.)
- In another filmed version of the third act, Joseph Lynch would steal Arno Dorian's Guillotine Gun from the Abstergo museum and use it to aid in the battle. After being taken down by Abstergo guards, he would give Cal his mother's necklace with his dying breath.
Trivia / Assassin's Creed (2016)