The film features the highest free fall performed by a stuntman in almost 35 years. The stuntman Damien Walters performed a free fall from the height of 125 feet (38 meters), which lasted almost 3 seconds with a 61 mph impact speed.

Michael Fassbender and Ariane Labed did 95% of the fights in the film themselves.

Cal's father, Joseph is played by Brendan Gleeson and the young Joseph is played by Brian Gleeson - who is actually Brendan's son.

Ubisoft gave the prop makers a detailed list of every weapon ever made for the games that they could use as a guide.

The Assassins costumes took 2-3 months to make and were all hand-crafted. There are eight versions of each costume, with an entire costume team devoted to each of the Assassins.

80% of the film, including stunts, extras and locations, were shot on camera, without using CGI.

Director Justin Kurzel didn't want to show Assassins as heroes and Templar as villains, or the opposite, because both ideologies can't be clearly called right or wrong and both of them can be corrupted, they can go to extremes: anarchy for Assassins and control for Templars.

Fassbender was attracted to the project because he wanted to do a fantasy film that was rooted in science, and also thought the idea of Templars vs. Assassins was intriguing.

This movie is based on a game with the same name. The actor Michael Fassbender had never played any of the nine games in the series until just before filming commenced; he didn't even know that the games existed until he was hired by Ubisoft.

As one of the producers, Michael Fassbender lobbied to have Justin Kurzel directing the movie following their work on Macbeth (2015). Fassbender also chose Marion Cotillard to be his co-star again.

Marion Cotillard told French magazine Studio Ciné Live in May 2016, that when she was on the set of From the Land of the Moon (2016), she received a new version of the script of Assassin's Creed and discovered that her character and by extension the film, no longer corresponded to what she had loved. So she called director Justin Kurzel and he fully agreed with her disagreements. For fifteen days, Kurzel, Michael Fassbender and Cotillard reworked the script.

The story of the film will be a new screenplay written specifically for this purpose, and not following the storyline of the games, allowing Ubisoft to develop unique stories for the big screen while maintaining their stories on our small screens.

In the Assassin's Creed video game series the present-day character, Desmond, has a scar on the right side of his lip. This same scar can also be seen on the assassin from the first game, Altair, as well as the assassin from Assassin's Creed II, Assassin's Creed: Brotherhood, and Assassin's Creed: Revelations, Ezio. Coincidentally, Michael Fassbender also has a similar scar on the same side of his upper lip.

The historical sequences set in 15th century Spain were shot in Spanish language. According to Justin Kurzel, they tried to do them in English first, but the decision about Spanish was too obvious and good, and it adds an exoticness and richness to the film. In the games, however, these sequences were in English, as well as all the modern-day scenes. Which was explained by the presence of built-in translator in the Animus machine.

While portraying Aguilar de Nerha, the protagonist of the past time-line, Michael Fassbender wore brown contact lenses, creating an alienating effect to the outward world and achieving the subtle difference between him and Callum Lynch, the protagonist of the present time-line.

Michael Fassbender was Ubisoft's first choice to play the franchise's iconic hooded hero, according to Jean-Julien Baronnet, CEO of Paris-based Ubisoft Motion Pictures. Baronnet also stated in an interview that none of Ubisoft's upcoming film adaptations will follow the same plot as their respective games, but will instead focus on telling new stories parallel to those games.

Aguilar's costume is made of six thousand beads, all manually sewn.

Michael Fassbender actively participated in the film's post-production, including editing.

Director Justin Kurzel's main desire regarding this film was to keep things as real as possible. The majority of action sequences, including stunts, were made as much as possible in camera.

Kurzel didn't want the movie to feel like a superhero film, he wanted to embrace "what it is to be human" through practical effects and parkour-intensive stunts.

Michael Fassbender became a producer on this film because he wanted to work on something that he could know and see start up from the beginning.

Director Justin Kurzel wanted to make the events of the past timeline look and feel less like a fantasy and more like the actual historical context.

According to Michael Fassbender, the main approach in creating this film was to respect many things from the games but at the same time to give it a personal touch.

The drones were largely used to shoot some of the most agile action scenes of the film.

Robert Downey Jr. was rumored to appear in the film as Leonardo da Vinci.

In the games, the Animus is a virtual reality machine rediscovered, developed, and sold by Abstergo Industries. It allows the user to read a subject's genetic memory, and project it onto an external screen in three dimensions.

During one of the chase scenes where Ojeda is pursuing Aguilar and Maria, a soldier is knocked off a wall and lands in a pile of hay. In the Assassin's Creed games, haypiles were most frequently used to break the fall of the protagonist, especially when leaping from a high viewpoint.

Aside from Abstergo CEO Alan Rikkin (who appeared briefly in the first Assassin's Creed game), the film features all new characters, designed and created from an original story.

Originally, it was going to be 2 hours and 20 minutes. It was then shortened to only 1 hour and 48 minutes.

Cameo: In the scene when the Animus is shown for the first time you can see the Animus 2.0 (used in Assasin's Creed II & Brotherhood video games) in the background over Cal's shoulder.

Alicia Vikander was considered for the role of Maria before Ariane Labed was cast. Vikander dropped out as she chose to do Jason Bourne (2016) instead largely due to fan factor. According to her, the role of Maria was one of the three roles offered at the same time besides Heather in Bourne and the lead role of Mae Holland in The Circle. Alicia would go on to play another video game character, Lara Croft.

During the building of the courtyard set in Malta, a storm produced a waterspout which moved on to land and hit the set directly causing damages.

Michael Fassbender puts the themes of the film to the contrary of the Star Wars, in which there's a dark side and a light side, while this movie is a very ambiguous morally: both of the sides - the Templars and the Assassins - are hypocritical at certain points, and there are not clear-cut good and bad characters. From this point of view, the film is a little more provocative for an audience, because it doesn't tell people to which characters they should empathize and what to feel about each one of them.

Fassbender got involved with the film very early on in the process, and brought his "MacBeth" director with him. Kurzel was approached for "Assassin's Creed" while he was still editing "Macbeth".

Justin Kurzel's 5th film but it's his biggest budget for a film. "Assassin's Creed" cost $130 million. Compared to his last film, "Macbeth", which cost $15 million.

The protoganist's name 'Aguilar' is a Latin word which stands for 'Eagle', which is the trademark for the video game series and the bird that is directly connected to the Assassins's(Assassin's are known to have the eagle vision).It is prominently featured in all the 'Assassin's Creed' video games.

According to producers, Justin Kurzel directed huge action sequences really fast thanks to his high level of organization. For example, they prepared horses for five weeks for an action scene, but the scene itself was shot within three days.

Was set to be released in 2015, but was pushed back to 2016.

Ubisoft changed their distributor from Sony Entertainment to 20th Century Fox, though the reason for this has not been made known.

The original name for the main character in the past timeline was Aguilar de Algarrobo. Later it was changed to Aguilar de Nerha.

Michael Fassbender's second role in a video game franchise. He previously provided the voice of King Logan in Fable III (2010).

The second collaboration between Michael Fassbender, Marion Cotillard, Justin Kurzel and Adam Arkapaw following Macbeth (2015).

Five actors had worked with Michael Fassbender prior to this film. Marion Cotillard in Macbeth (2015), Michael Kenneth Williams in 12 Years a Slave (2013), Denis Ménochet in Inglourious Basterds (2009), Brendan Gleeson in Trespass Against Us (2016) and Charlotte Rampling in Angel (2007). Carlos Bardem is the older brother of Javier Bardem, who had worked with Fassbender in The Counsellor (2013). Brian Gleeson is Brendan Gleeson's son and younger brother of Domhnall Gleeson, who co-starred with Fassbender in Frank (2014).

At the beginning of the film, seen in the backdrop of the exterior of Abstergo Industries in Madrid, a large soccer stadium is visible just behind the facility. This is the Estadio Vicente Calderon, old stadium of the 2014 champions of La Liga of Spain, Atlético Madrid.

According to Michael Fassbender, his favorite weapons in the film were blades and bow with arrows.

The film's cast includes two Oscar winners: Marion Cotillard and Jeremy Irons; and two Oscar nominees: Michael Fassbender and Charlotte Rampling.

The cast contains stars of various countries: Michael Fassbender is Irish/German. Marion Cotillard is French. Jeremy Irons and Callum Turner are English. Brendan Gleeson and Brian Gleeson are Irish. Michael Kenneth Williams is American. Carlos Bardem and Javier Gutiérrez are Spanish, Ariane Labed is Greek and Hovik Keuchkerian is Lebanese/Spanish.

Filmed in Malta (September 2015) under the working title of 'Time Out Of Mind' ('TOOM' for short) which was the title of Time Out of Mind (2014), which has no connection.

When Aguilar is being fitted for his hidden blade, his ring finger on his right hand is removed. This is counter to the game, whereas the hidden blade was designed for the left hand so that the Assassin's sword hand remained strong.

Michael Fassbender, Marion Cotillard and Jeremy Irons have all starred in films based on comic books, in particular Marvel and DC comics. Michael Fassbender played Burke in "Jonah Hex", and the young Magneto in Marvel's "X-Men: First Class", "X-Men: Days of Future Past" and "X-Men: Apocalypse", Marion Cotillard' played Talia Al Ghul in "The Dark Knight Rises" and Jeremy Irons played Alfred Pennyworth in "Batman v Superman: Dawn of Justice".

This marks the second collaboration between Jeremy Irons & Brendan Gleeson, previously acting in Ridley Scott's, Kingdom of Heaven (2005).

Olivia Munn expressed interest in appearing in the film.

Throughout the movie, you hear this said in Arabic by Cal's father and Ancestor... "La Shaaya Waqin Moutlaq Bale Kouloun Moumkin" Translated to English is, "Nothing is true, Everything is Permitted"

At the end of the film when the templers all meet up. The building they are in is the United Grand Lodge of England, the building is the main lodge for Freemasonry in the U.K.

In the scene in which Callum is surrounded by projections of his Assassin ancestors, one of them appears to be Arno Dorian, the protagonist of Assassin's Creed Unity.

In the film's finale, three other test subjects (Moussa, Nathan, and Lin) assist Callum in his escape and they all use their ancestor's weapons to fight the guards. Lin uses a rope dart and a boot hidden blade, notable weapons of the former Mentor of the Assassins in China, Shao Jun. Nathan uses what appears to be Duncan Walpole's cutlass from Assassin's Creed IV: Black Flag (as well as a phantom blade from Assassin's Creed Unity). Moussa uses poison bombs and has referred to his ancestor, Baptiste, by name earlier in the film. All of this information is indicative of the fact that these three are the descendants of Shao Jun from Assassin's Creed Chronicles: China, of Duncan Walpole from AC IV: Black Flag, and Jean-Baptiste from Assassin's Creed: Liberation (respectively.)

At the end of the movie Marion Cotillard's character suggests the line "Now I am become Death, the destroyer of worlds" as an introduction for her father's speech. The line is from the ancient Hindu scripture the "Bhagavad Gita" which was quoted by J. Robert Oppenheimer in his memoirs to describe his feelings towards his invention of the atomic bomb - his actual words on the test site was "It worked!". The line was also referenced in Assassin's Creed II, in a glyph puzzle created by Subject 16 regarding Oppenheimer and the atomic bomb.

The release date for the film, December 21st, is a reference to the date of the fictional apocalypse within the Assassins Creed franchise.

When Callum Lynch first meets Moussa, Moussa explains that he is also called Baptiste who was killed two hundred years prior with voodoo poison. This is a nod to Assassin's Creed 3 Liberation where the main protagonist Avaline kills Baptiste with voodoo poison.

Jeremy Irons is playing the villain in the Assassin's Creed movie. In the TV show The Borgias (an unrelated project), he also played Rodrigo Borgia, who is the main villain in Assassin's Creed 2 (video game).

Despite having been present in Spain to aid Christopher Columbus and assassinate Tomas Torquemada during the events of the film, as shown in the Nintendo DS game, Assassins Creed II: Discovery, Ezio Auditore da Firenze does not make an appearance in this film.

Whilst in 1492, an Inquisition soldier gets killed and falls into a hay cart, which is a nod to the games. In the games these carts are used as a crash mat by Assassins performing the well known Leap of Faith.

When Callum first falls into the Animus, the following scene shows a young prince getting caught by the soldiers. The leader orders the soldiers to hang his family in front of him. This scene is similar to Assassin's Creed II when Ezio's family (excluding his mother and sister) is hanged right in front of him.

In a early cut showed to numerous websites privately, when Callum would be walking to the execution room in prison the song "Young Men Dead" (performed by The Black Angels) was going to be playing as background music. Presumably, due to copyright issues, the song was removed. The filmmakers were able to attain the rights to another opening song, "Entrance Song", also performed by The Black Angels.