In the "Days of Future Past" comic, Mystique tries to assassinate Senator Robert Kelly, which leads to the genesis of the Sentinel program. In this film, Mystique remains the assassin, but as Kelly had appeared in X-Men (2000), her target is now Bolivar Trask, the actual creator of the Sentinel program.
According to Peter Dinklage, Bryan Singer picked him to play Bolivar Trask because of his height, stating, "With my Dwarfism, I'm a bit of a mutant. I can't move metal or anything, but I thought of it as self-loathing. Deep down, Trask is quite sensitive about that aspect of himself."
The filmmakers selected the "Days of Future Past" storyline, because it would allow the filmmakers to reconcile any continuity dissonances within the X-Men film franchise. The time-travel element also allowed actors and actresses from the first three films, and X: First Class (2011), to appear in the same film together.
Sir Patrick Stewart and Sir Ian McKellen were performing in a touring production of "Waiting for Godot", when Bryan Singer approached the actors about reprising their respective roles as Professor X and Magneto. According to McKellen, both men were utterly shocked, as they thought they had passed their roles on to James McAvoy and Michael Fassbender, and would never play the characters again. Stewart and McKellen were delighted to return to two of their most popular roles, and to work with the younger actors playing the same characters as well.
The script called for Logan to wake up in 1973 in boxer shorts. Hugh Jackman vetoed this, in favor of waking nude, saying, "In Australia, if you're next to a really good-looking girl, you're not getting out with boxer shorts on, or briefs, or anything!"
Including his cameo in X: First Class (2011), this is Hugh Jackman's seventh portrayal of Logan, a.k.a. Wolverine, which raised his own record for the most times a comic book character has been played by the same actor in theatrical films. Jackman is also the only actor to appear in the entire X-Men film franchise.
In the original comic storyline, other Marvel heroes, other than the X-Men, are wiped out by the Sentinels, such as Spider-Man, Ghost Rider, Daredevil, Iron Man, Hulk, The Fantastic Four, and someone who looks like the Silver Surfer, but is more likely Bobby Drake (Iceman).
When Wolverine wakes up in the past, the woman in bed with him calls him Jimmy. According to the comics and later films, Wolverine's name at birth was James Howlett (as his birth father was Thomas Logan, he inherited that surname).
The addition of Evan Peters as Pietro Maximoff, a.k.a. Quicksilver, to the cast sparked wide discussion over the direction of the character, who was also slated to appear in Avengers: Age of Ultron (2015). Quicksilver had been discussed previously as a potential character in both X-Men: The Last Stand (2006) and The Avengers (2012), but legal complexities over the license to the character resulted in his omission from both films. However, in May 2013 both Marvel and Fox Studios announced a resolution to the previous legal issues, and that Quicksilver would appear in this film as well as an Avengers sequel, though under certain parameters: no reference to Quicksilver's membership in the Avengers can be made in an "X-Men" film, and no allusion to his relations to the X-Men or Magneto (the character's father) can be made in an "Avengers" film. The rights agreement between Fox and Marvel even goes so far as to stipulate the character cannot be referred to as a "mutant" in any Marvel film. Additionally, the day after the announcement of Peters's casting, Marvel and Fox entered into a legal standoff over provisions of the rights agreement for the character, including the issue of whether Peters would be allowed to portray Quicksilver in any other film outside the X-Men film franchise, possibly necessitating a second actor to play Quicksilver in any Marvel film, resulting in two different versions of the same character appearing in two competing film franchises. Ultimately, Fox and Marvel decided to cast different actors in the part for the "X-Men" and "Avengers" films, with Aaron Taylor-Johnson taking on the role in the latter sequel, thus preventing any connection between the two franchises and keeping the X-Men confined to a separate universe from those of the Marvel Cinematic Universe.
This is the sixth time that Sir Patrick Stewart has appeared in an X-Men film. Stewart had made an uncredited appearance in X-Men Origins: Wolverine (2009), and appeared in The Wolverine (2013)'s credits scene. The only X-Men movie he wasn't involved in, up to this movie, was X-Men: First Class (2011).
Young Xavier tells Logan to "Fuck off". This was the original scripted line for Hugh Jackman's cameo in X: First Class (2011). However, Jackman instead improvised the "Go fuck yourself" line. In Logan (2017), Xavier says this line again to Logan, but with Sir Patrick Stewart in the role.
Although Anna Paquin's screentime is only three seconds, and she has no lines, she still was one of the top billed cast members during the ending credits. The Extended Cut of the movie, however, restores a subplot, in which she features prominently (and has therefore been dubbed "The Rogue Cut").
When Quicksilver asks Magneto if he knows karate, Michael Fassbender replies "I don't know karate, but I know crazy". This is a James Brown lyric in his early 1970s hit song "The Payback". This song featured prominently in Lock, Stock and Two Smoking Barrels (1998), a film Matthew Vaughan produced, and in which Jason Flemyng (Azazel) appeared.
Bryan Singer based the time travel in the film on string theory: "Until an object is observed, it hasn't really happened yet. The time-traveller, whose consciousness travels through time, I call The Observer, and until the Observer returns to where he travelled from, the result hasn't occurred yet. So he can muck about in the past, and it isn't until he snaps back, that the new future is set. As a result, we have parallel action, and there's underlying tension, because there's always that threat Wolverine's consciousness could return to the future, and leave the world in an even darker place."
According to Bryan Singer, he had a two-hour discussion with James Cameron, about how to make the time-travel concept feasible and workable within the film. The concepts the two discussed included quantum physics, alternate universes, and string theory.
Production Designer John Myhre described the future Sentinels as having evolved from machines into biomechanical weapons: "They are almost made up of magnetic plates slapped over one another, imagining that the plates could contract or grow, so the Sentinel can be skinny to get through a small space or the plates can open up to become a bigger shape. They have become virtually unstoppable, the ultimate version that can actually, in principle, stop the X-Men."
The two teaser posters for this film are in the form of wanted posters, of Professor X and Magneto with an X over their faces. This was taken from the "Days of Future Past" comic, which prominently featured an image of wanted posters of mutant outlaws.
The dissertation, from which Bolivar Trask reads, during his Senate Committee hearing, which outlines that the emergence of Homo Sapiens led to the extinction of the less-evolved Neanderthal ancestors, was written by Charles Xavier, and was partially read to Raven in X: First Class (2011).
Jason Flemyng was originally set to reprise his role as Azazel when Matthew Vaughn was still set to direct. When Vaughn left, the storyline was dropped, in favor of the time travel and crossover storyline, and Azazel's role cut from the script to accommodate characters from the first three X-Men films. Flemyng still appears in an autopsy photograph of Azazel in the film.
Bryan Singer based Bolivar Trask on Adolf Hitler: "As Hitler used the Jews as a scapegoat to bond the darker parts of Europe, he's doing the same thing with mutants. But he wasn't a six foot, perfect blond Aryan. He was a short, funny looking fellow!"
The release of the teaser trailer for this film ignited such interest, Bryan Singer made the unprecedented move of recording an actual commentary track to it the following day, explaining the significance of certain scenes and offering more insight into what to expect from the film.
Logan's 1973 apartment is colored in shades of yellow and brown, Wolverine's prominent uniform colors. The apartment is also decorated with samurai swords and a photo of Mt. Fuji. This pays homage to his last film The Wolverine (2013), where he was a prisoner of war in Japan in 1945, and went back to Japan in the present day.
This is the first X-Men film where Professor X (Sir Patrick Stewart) wears something other than his trademark suit. Bryan Singer felt it wouldn't work for the Professor to have a suit in an apocalyptic future.
At the beginning of the film, as the mutants and humans march down the corridor, a quick glimpse is shown of an older Quicksilver from behind. He is directly in the center of the frame, and is easy to spot with the same hairstyle and hat his younger self has in the movie.
This is the fourth X-Men film to be based on a Chris Claremont X-Men comic: - X2: X-Men United (2003) was adapted from "God Loves, Man Kills". - X-Men: The Last Stand (2006) was based on "The Dark Phoenix Saga". The Wolverine (2013) was based on the 1982 Limited Series "Wolverine".
Bryan Singer and Peter Dinklage describe Bolivar Trask as a peace-lover: "He feels that humanity will go on fighting each other, unless they can find a common element to unite against. He sees the advent of the mutants as a way to unite people. He sees what he's doing, as a good thing. His ambition is definitely blind. He's strove all his life for a certain respect and attention."
John Myhre hid X-symbols in the sets he designed for the film. They can be seen as follows: - the badge seen in the future before the title sequence. - the staircase at the X-Mansion. - the design of the Pentagon kitchen (seen in an overhead shot). - the Cerebro hallway (a scene where the lights are turned on resembles a cross). and the X-bar that traps Xavier in Washington, D.C.
Hank McCoy develops a serum that suppresses mutation through dulling emotion, which he provides for Xavier and himself. This pays tribute to his debut appearance in X-Men: Evolution (2000), where he frequently takes a serum to suppress his rage, and thus his bestial mutation.
According to John Myhre, the past Sentinel robots were inspired by 1970's molded plastics: "It was the idea of being inspired by 70's product design that helps out. We made them a little fun and stylish, but also a little retro, and the key is, they're not made of metal."
A real website was created for the Trask Industries, which is available at the address www.trask-industries.com. In the website are revealed details about the Sentinel Program, and it is even possible to make an application for a job within the company.
During Magneto's fight with the Presidential guards, there is a painting behind him. This painting is Eugene Delacroix's "Liberty Leading the People", made to commemorate the 1830 French Revolution, and a symbol of rebellion.
When talking to Beast, Logan says he hopes he isn't a parent. Wolverine has sired several children throughout Marvel comic book history: He sired Daken Akihiro (Dark Wolverine) and he was cloned to create Laura Kinney (X-23), whom he treats as a daughter. In the "Ultimate Marvel" universe, he is the father of Sabertooth and Jimmy Hudson (the second Wolverine), in the MC2 Universe, he and Elektra give birth to Rina Logan (Wild Thing) and in the "Future X-Men" storyline, he and Mystique sire Raze Darkholme.
During filming, Bryan Singer had injured his vocal chords, and could only speak without doing further damage with a falsetto. Thus, his orders on-set led all actors and actresses to crack up at some point.
According to Simon Kinberg, this film unites ALL the future mutants: "It's this dysfunctional family, and these desperate people, who are outcasts in their own lives, and they come together, and that's not as emotionally satisfying as an outcast on their own."
During the scene, in which Professor X attempts to use Cerebro for the first time in several years, while he is scanning through the "voices in his head", one voice in particular, is heard not speaking nor exclaiming in general, but specifically addressing him (Professor X). One may presume this is the young child Jean Grey, a fellow psychic featured prominently in the comics and previous films.
Because of a contract dispute over director Marc Webb, Sony (Columbia) agreed to place a mid-credits teaser for this 20th Century Fox film into Webb's The Amazing Spider-Man 2 (2014). The scene, which was not included in the video release of that film, is unusual for a mid-credits teaser, in that it is actual footage from the film it is promoting (the scene in Vietnam with Stryker and Mystique).
According to Simon Kinberg, the story's main theme is hope: "It confronts the notions of second chances. It's about characters that are lost, trying to find themselves. In the other films, the characters had come into their own, and knew who they were. In this one, they're all lost and they're trying to keep it together."
In the original comics, Quicksilver was named Pietro Maximoff. His first name was changed to Peter in the film, not just to make him more American, but also to help make him more distinguished from the version of the character from the Marvel Cinematic Universe.
In an interview on the The Graham Norton Show (2007), it was revealed that the first scene James McAvoy shot, was the scene with Sir Patrick Stewart, when the young Xavier mentally "visits" the future, and communicates with his older self.
When Matthew Vaughn was set to direct, Juggernaut was going to be the one who broke Magneto out of prison. Josh Helman had been cast in the role. When Bryan Singer took over directing duties, he decided to use Quicksilver instead, as Juggernaut had already been used in X-Men: The Last Stand (2006). Helman was re-cast as the young William Stryker. The announcement that Quicksilver would be in this film, came after he was announced for Avengers: Age of Ultron (2015), so his inclusion may have been 20th Century Fox's way of asserting their ownership of the character.
For X-Men: First Class (2011), James McAvoy shaved his head in preparation for the role of Charles Xavier, before learning that the producers wished the younger Xavier to have hair. Ironically, this film features the hairiest depiction of the character yet, sporting a full beard and long locks. McAvoy finally played Xavier bald in X-Men: Apocalypse (2016).
The television show glimpsed on Hank McCoy's television set, is Star Trek (1966), specifically the episode "The City on the Edge of Forever". This episode featured Kirk and Spock traveling back through time to correct a disruption in the timeline that has derailed their past (caused incidentally by Dr. "Bonze" McCoy of the Enterprise crew).
Simon Kinberg's original script reportedly followed the original storyline more closely with the character of Rachel Grey sending Wolverine back, but eventually replaced her with Kitty, and upgraded her phasing and intangibility, to being able to phase things through time.
With this film, and especially the extended "Rogue Cut", Bryan Singer essentially ignores several plot points from other films in the franchise, so as to streamline and focus on the plot of this one. For example, Wolverine still maintains his adamantium claws in the future, despite losing them in The Wolverine (2013); Professor X is alive, despite dying in X-Men: The Last Stand (2006) (however, in the end credits scene from "Last Stand", "P. Xavier" awakens from a coma, with twin brother Charles' mind inhabiting his body, due to a transference). Magneto and Rogue still have their powers, despite losing them to the mutant cure in the same movie (although that film already implied that the effect of the cure wasn't permanent in an end credits scene). Both these films were notably not helmed by Bryan Singer, but by James Mangold and Brett Ratner respectively. All of this becomes unimportant following the ending of this film, where the unforeseeable repercussions of Logan changing the future allow for such indiscretions.
Plot similarities to X2: X-Men United (2003): the previous film begins with an assassination attempt on an unnamed President. The plot in this one revolved around preventing an assassination; first of Bolivar Trask, and subsequently of Richard Nixon. In the earlier film, the would-be assassin was Nightcrawler. In this film, it is Mystique, who, in the comics, is Nightcrawler's mother. Both also involve Xavier and Magneto joining forces to prevent the political fallout from the attempt.
Almost all of the promotional photographs and posters of Major Stryker had the blue enamel of his Combat Infantry Badge "corrected" to green. Blue is the color of the U.S. Army's infantry branch. It appears the right way in the film.
When Hank hacks the surveillance monitors, one of the shows seen on the screen is Star Trek (1966). Sir Patrick Stewart appeared in Star Trek: The Next Generation (1987) as U.S.S. Enterprise Captain Jean-Luc Picard. Moreover, Picard encountered and conversed with his future self in the episode "Time Squared", on averting a disaster, and later on, travelled back in time to stop the Borg in Star Trek: First Contact (1996).
Wolverine wakes up in 1973, and learns that his claws are bone, not metal, and that he does not remember sleeping with the young woman, with whom he is in bed. In X-Men Origins: Wolverine (2009), which took place six years after this film, Wolverine gained metal claws made from Adamantium, replacing his bone claws, and suffered permanent amnesia when being shot in the head by William Stryker.
The documents Mystique discovers in Trask's office mention the names of crew members G Ferderber and E Kephart. Genevieve Ferderber was the film's set decorator and Elza Kephart was the Art Department clerk.
Warpath carries two knives in the film. In the comics they are made of the metal vibranium, but vibranium belongs to Marvel, while adamantium belongs to 20th Century Fox. It is thus likely, that Warpath is using adamantium knives.
Comic book Writer and Artist John Byrne, who had worked on the "Days of Future Past" comic, is on record stating he was not approached for a cameo in the film. He says he would have declined, stating he disliked the films, and he'd feel "like he was in the Carrie (1976) prom scene".
Many summaries of the film (particularly those written prior to its release) claim that the plot of the film involves the X-Men going back in time and teaming up with their former selves. No such thing happens in the movie. Only Wolverine travels back in time, and does so retaining his 1973 body, so he has no way of encountering a "past self".
This is the third film, in which Hugh Jackman (Wolverine) plays a time traveller, after Kate & Leopold (2001) and The Fountain (2006). This is, however, the first film where he travels to the past, while the other films had him travel to the future.
The version of the American flag with the Trask Industries emblem (the curtain used to conceal the Sentinels during their unveiling at the White House) is reminiscent of the flags that were used by protesters during the 2000s decade, which were adorned with the logos and emblems of corporations that people believed had influence over the United States economy and high-ranking politicians.
There appears to be a hidden Mickey a few seconds into the opening credits, when three bubbles join together to form a Mickey Mouse head. However, the rights to this film are owned by 20th Century Fox, and it has nothing to do with Disney.
All of the scenes that are supposed to take place in Paris, were shot in Old Montreal. The building seen from almost all angles is actually City Hall, and the fountain is located in the small Place Vauquelin just beside it. Ironically, for something that is supposed to be in France, is seen in the background a column erected to Lord Nelson in 1809. Even Mark Twain, when visiting Montreal in 1881, noticed it and declared with is habitual humor: ''I have observed here, with emotion, in your city, the monument which rendered for ever famous the exact place where Horatio Nelson didn't stood when he felt."
When Wolverwine travels back through time, and wakes up in 1973, he is naked. A possible nod to The Terminator films. In those films, The Terminator travel back through time, and arrived in the past bare beam and buck naked.
In this film, which partly takes place in a post-apocalyptic future. Professor Xavier (Sir Patrick Stewart) sends Wolverine back through time to prevent the assassination of Bolivar Trask, creator of the Sentinel robots. In Stewart's earlier film, Star Trek: First Contact (1996), Captain Jean-Luc Picard (Stewart) and the Enterprise crew travel back through time to post-World War III Earth, to stop the Borg from converting all human life on Earth into Borgs, and also prevent them from stopping First Contact, and changing history.
Young Charles Xavier mentions to Wolverwine that Wolverwine told him to "F*** off!" when Charles and Magneto met him at a bar and offered him to join the newly formed X-Men which Wolverine rejected in X-Men: First Class (2011), which happened before Wolverwine was shot in the head with an Adamantium bullet by William Stryker which caused Wolverwine to suffer permanent amnesia and Wolverwine would not recall meeting Charles and Eric prior to X-Men (2000) or saying that to him.
The film and in particular the Sentinels and Trask himself was foreshadowed in X-Men: The Last Stand (2006). In that film, The X-Men fight a giant robot in a simulation of a battle in a ruined city and the head of the Department of Homeland Security (Played by actor Bill Duke) was called Trask. However, the two Trasks played by Bill Duke and Peter Dinklage are not the same character and are unrelated.
The trivia items below may give away important plot points.
The cameos of Cyclops (James Marsden) and Jean Grey (Famke Janssen) were so tightly guarded, that the actor and actress, as well as Bryan Singer outright lied about their appearance in the movie, to keep their return a surprise.
Two of Peter Maximoff's (Quicksilver's) relations are implied, but never outright stated in the film. He first remarks to Magneto that his mom used to know someone that could manipulate metal. In the comics, Magneto is in fact Quicksilver's father. This is further implied when Peter's Mother sees Magneto on television and reacts with horror and recognition. A deleted scene also addressed that Peter has a sister, Wanda Maximoff, also known as Scarlet Witch. It is confirmed, in X-Men: Apocalypse (2016), that Magneto is Peter's father.
In the post-credits scene, the pan around to the front of the character building the pyramids reveals the silhouette of four individuals on horseback. These are the Four Horsemen of Apocalypse, four super-soldiers he converted and enslaved.
In the scene where Trask and Nixon discuss the implementation of the Sentinel program, an aide is seen switching off a tape recorder. This is a sly reference to the infamous eighteen and a half minute gap on Nixon's Oval Office tapes, long thought to have been deliberately erased by Nixon, or his aides, to cover-up politically damaging information. Former Nixon adviser H.R. Haldeman has said the erased conversation contained references to Nixon's involvement in the Kennedy Assassination, another subtle joke in the film, as Kennedy is revealed to have been a mutant.
Bryan Singer filmed Quicksilver's scenes in a special format of thirty-six hundred frames per second. This means that Quicksilver moved one hundred fifty times faster than normal. The camera was used to record close-ups and movements of Evan Peters, as well as the guards he beat.
When describing Mystique's capabilities to the President in the Oval Office, Trask tells him that she could take any shape including that of a Colonel, a Secret Service Agent, and even the President himself. That is the order of the key shapes she takes on during the film.
In the original cut of the film, when Wolverine injures Kitty Pride after encountering Stryker, Kitty was to bleed to the point she could no longer hold Wolverine in the past. Iceman would reveal that Rogue, long thought dead by Xavier, was actually being held in the one place he could never telepathically locate her: Cerebro. To ensure Wolverine can complete his mission, Iceman, Magneto, and Professor X return to the X Mansion, which has been taken over by Trask Industries, to rescue Rogue, so that she can absorb Kitty's powers. Iceman was to die in the rescue, and the X-Jet has to fight off several Sentinels in order to escape. These scenes also explained more clearly how the Sentinels were able to track the remaining X-Men. A part of one of the Sentinels remained on the jet, enabling the others to follow the jet back to China, leading to the final battle at the monastery. Portions of this sequence appear in trailers, and these scenes were fully restored in the Extended Edition (Rogue Cut) of the film.
Mystique rescues Havok, Ink, and Toad from Stryker in Vietnam. Later in the film, when Magneto makes his broadcast, Ink and Toad are seen, but not Havok. Havok was to be captured and used to test a prototype Sentinel. This was left out of the film, for running time purposes.
Although their characters are father and son (although never explicitly stated in this film, but it is confirmed in X-Men: Apocalypse (2016)), Michael Fassbender and Evan Peters are only ten years apart in age.
In the "Days of Future Past" comic, it was Kitty Pryde who went back in time; in the film, it's Wolverine. According to Writer Simon Kinberg, Kitty was intended to be the time-traveller, but it didn't work out: "Kitty in the era of young Magneto and Xavier would have been negative twenty-years-old. The reflex response to that was a character who doesn't age. Wolverine is the only character who would look the same in 1973, as he does in the future." Thus, Wolverine was picked for being an ageless immortal character who would bridge past and future.
A sequence where Mystique returns to the X-Mansion following Xavier contacting her telepathically in the Paris airport was filmed, but cut. In this sequence, Wolverine would explain the origin of the Sentinels and the Future War, and Mystique would have a romantic encounter with Beast, carrying over on a subplot from X: First Class (2011). These scenes were cut for runtime purposes, but have been partially restored in the Extended Edition (Rogue Cut) of the movie.
Sir Patrick Stewart enjoyed James McAvoy's light-hearted performance as Charles Xavier in X: First Class (2011), and had wanted to try a similar performance with Xavier, instead of keeping him grave and sober. He got his wish with this film: in the altered future, his Xavier is just a bit jollier.
Originally, Raven was to choose to go with Charles instead of Erik, and would appear in the altered future teaching a biology class with an older Hank. Meanwhile, Logan would be retrieved from the Potomac River by Stryker, thus bringing around the Weapon X story arc. The filmmakers felt this was too predictable, and sad an ending, so it was changed to Raven simply escaping and making her own agenda (under Stryker's form), to make the ending more unexpected.
Originally, the prison break scene was conceived with Juggernaut in mind. He was meant to be a football player at the X-Mansion. However, he was replaced with Quicksilver, whose power seemed more stylish and smooth.
The appearance of the X-Men in the restored future resembles their appearance in the X-Men comics almost exactly: Kitty and Colossus are seen teaching a class together (as in the comics) and Rogue and Iceman are seen walking together (not in the comics).
When Matthew Vaughn was going to direct, he was going to make the film a direct sequel to X: First Class (2011) and have it set in the 1970s. Early ideas included an opening with the Kennedy assassination being caused by Magneto, and mutant encounters set during the Civil rights movement and the Vietnam War. When Singer took over, he integrated these concepts into a viral marketing campaign to set up the action of the film. In this alternate history, Magneto is arrested and imprisoned for the assassination of Kennedy, but maintains his innocence. The "Bent Bullet" Theory (a reference to the real life "Magic Bullet" Theory criticized by conspiracy theorists) holds that the Warren Commission determined that Magneto manipulated Lee Harvey Oswald's bullets to kill the President in retribution for the murder of the mutants Azazel and Tempest (from X: First Class (2011), though in the film, Tempest was codenamed Angel) by the C.I.A. Conspiracy theorists, based on Magneto's testimony, insist however that Magneto had tried to prevent the murder of Kennedy, and that the true shooter was not Oswald, but Mystique in disguise, who, with the help of Emma Frost (also from "First Class"), framed Magneto, and manipulated Jack Ruby into later murdering Oswald. The theory also posits that Mystique offered to double as Kennedy in an attempt to grab power, all of which backfired horribly, leading to anti-mutant hostilities.
When Mystique breaks into Trask's files, she learns that he had several mutants tortured and killed for research. Among the mutant files she views are Azazel and Angel, who became her colleagues at the end of X: First Class (2011).This explains her uncharacteristic empathy in this scene, especially since Mystique and Azazel had a relationship in the comics, with her giving birth to Nightcrawler.
Simon Kinberg said that in the unwritten backstory, Bolivar Trask was part of the group responsible for attempting to assassinate the mutant American President John F. Kennedy. Kinberg also said that Trask had militarian supporters in the U.S. Government, and that during the Vietnam War, any soldier with a higher than anticipated kill record, would be subjected to tests by Trask Industries to determine whether he was a mutant. Those found to be a mutant were put into quarantine.
The British movie magazine Empire had a front cover pulled out of production by Bryan Singer, as it featured a photograph of Bolivar Trask in a straitjacket. Singer felt it gave the ending of the film away.
1973, the year, to which Wolverine travels back through time, is six years prior to Wolverine gaining Adamantium claws and losing his memory in the original timeline, which happened in 1979, just prior to the infamous Three Mile Island incident (as seen in X-Men Origins: Wolverine (2009)).
The baseball stadium Magneto destroys in the film, is the old Robert F. Kennedy Memorial stadium. The Washington Senators played there until September 1971, and the Washington Nationals played there in 2005. Since the film takes place in 1973, it makes the stadium employee laying down chalk seem odd, since baseball wasn't played there at that time.
Continuing a trend to insert the X-Men characters into real-world historical events, this movie places them into the Vietnam War, and the 1973 Paris Peace Accords (and Magneto is indefinitely detained on suspicion of being involved in the 1963 Kennedy Assassination, but those events are not shown).
In the post-credits scene, where Apocalypse is introduced, the crowd worshipping him is chanting what the subtitles call a foreign language. They are saying "En Sabah Nur," which was the name given to him when he was found as an infant, and his potential was realized.
The bullet wounds that appear on Wolverine's chest on his arrival to the 1970s is in the form of the Big Dipper. This is a homage to Fist of the North Star (1984), whose protagonist Kenshiro has the same scar pattern on his chest.
The film's future era is a homage to "Age of Apocalypse", an X-Men comic where the mutant Apocalypse makes a takeover of Earth (and which is to lead into X-Men: Apocalypse (2016)): much of the story is set in a dystopian future, and involves travelling to the past to erase this future Magneto is allied with the X-Men. Blink and Bishop appear as members of the future X-Men. the changing of history results in Apocalypse's existence.
In the comics, Magneto had three children: Quicksilver, Scarlet Witch, and Polaris. The Extended Edition (Rogue Cut) mentions Polaris, when Mrs. Maximoff tells Wanda (Scarlet Witch) to "go bug her sister".
Towards the end, where the final battle is between the surviving mutants at the monastery in China, two Sentinels turn into a rock diamond form and rocky form. These forms are references to Emma Frost and Darwin from X: First Class (2011), who have these abilities.
The events of this film end in 1973 and 2023, respectively. That will mean that in X-Men: Apocalypse (which takes place circa 1983), Wolverine should have no recollection of his involvement in preventing Mystique from assassinating Boliver Trask, nor any knowledge of the future, since the consciousness of that Wolverine was returned to 2023.
The film contains references to Wolverine and the X-Men (2008), which adapted "Days of Future Past" as a major element of the show: - The future Sentinels copy and adapt to mutant power. - The future mutants in this film share similar powers with the future mutants from that show (Warpath and Marrow are enhanced beings with knives, teleporters Blink and Vanisher, Sunspot, and Firestar can control fire, super-strong fighters Colossus and Kamal, electric mutants Storm and Berzerker, Magneto and Polaris can manipulate metal), as well as featuring Professor X, Wolverine, and Bishop, all of whom appeared in the movie. - A future mutant gets his mind sent back into the past (Xavier in the cartoon, Logan in this film). and Magneto gains control of the Sentinels.
The film contains references to X-Men (1992), which adapted "Days of Future Past" for the first time: - Bishop is the first mutant sent back in time. - A misunderstanding allows the assassin to escape and make a second attempt. and Apocalypse is waiting to appear.
In the movie, Magneto embeds metal bars into Wolverine to prevent him from moving, and launches him into Potomac River. Wolverine's appearance (metal sticking out of his body) is an homage to an event in the comics, where Magneto ripped the adamantium out of Wolverine's body.
In the film, President John F. Kennedy is heavily implied to be a mutant. In the year previous to this film's release, James Marsden (Cyclops) portrayed Kennedy, and Liev Schreiber (Sabretooth) portrayed his successor Lyndon Johnson, in The Butler (2013).
Close to the end of the movie, Peter (Pietro) Maximoff, a.k.a. Quicksilver, is seated in front of the television watching Magneto (his then unknown biological father) with a little girl on his lap. This caused confusion for fans who know that Peter has a twin sister named Wanda, a.k.a. Scarlet Witch. The little girl is most likely Lorna Dane a.k.a. Polaris, the youngest of the three Maximoff kids. In the Extended Edition (Rogue Cut) of the movie, Peter's mother tells her to go play with her sister. This implies that Wanda is somewhere else in the house. That explains why the girl on Peter's lap is too young to be Wanda, but this explanation was not in the final cut, thus the confusion. Quicksilver is, so far, the only character who is allowed to be in both the X-Men franchise (Fox) and the Avengers franchise (Marvel), and that was a point of contention between the two. After that battle, they probably decided not to do the same with Wanda, especially because she has a more prominent role in the Avengers, than the X-Men.
Sir Patrick Stewart and James McAvoy, who both play the same character, had previously starred in Gnomeo & Juliet (2011). In both films, Stewart's character is able to advise McAvoy's character at a crucial moment.
In Logan (2017) which takes place in 2029, Charles Xavier mentions the battle on Liberty Island that occurred in X-Men (2000). Since X-Men: Apocalypse (2016) is set in a new timeline, which is established when Logan traveled back through time to 1973 and changed history and Logan wakes up in alternate 2023 - It is likely Logan and Charles Xavier's deaths occur 6 years after Logan wakes up in the School of the Gifted in alternate 2023.