The scenes of Sir Edmund Burton (Sir Anthony Hopkins) visiting 10 Downing Street, were filmed at the actual office of the British Prime Minister in October 2016.

With a budget of two hundred seventeen million dollars, this is the most expensive Transformers film to date.

Mark Wahlberg announced this will be his last Transformers movie as Cade Yeager. He had signed a contract for three films, with the knowledge that he could be relieved earlier.

Director Michael Bay is a noted dog lover, and he cast Freya, a British dog with epilepsy that many homes had rejected, in the film.

Writer Matt Holloway is a fan of the drama Downton Abbey (2010), and jokingly said that Jim Carter (who plays the butler Mr. Carson in the show) should voice Cogman. He was shocked when Michael Bay got Carter signed on as Cogman.

Michael Bay said that this will be the last Transformers film he will direct, for the moment. He is open to doing more films in the future, if he gets a good story.

Quintessa's design is based on Alpha Q's design in Transformers: Energon (2004) (a humanoid upper body with tentacles for legs), and the Quintesson's facial designs in The Transformers (1984) (a face with a headdress). The headdress incorporates elements of the Autobot and Decepticon insignias, reflecting her role as the Transformers creator.

Blenheim Palace was decorated as a Nazi headquarters for the World War II scenes. This caused controversy among British war veterans, who protested that the palace was the former residence of war hero Winston Churchill, and did not deserve such treatment. Michael Bay explained that this was part of the film, and Churchill's grandson Sir Nicholas Soames lambasted the British press for sensationalizing a mere film scene.

After the release of Transformers: Age of Extinction (2014), a writers' room was set up to plan the franchise's future beyond the main film series. Two of the ideas pitched involved the Arthurian myth and World War II respectively. Michael Bay liked them so much that he decided to incorporate them into the script for this film.

Hot Rod is the second Lamborghini Transformer to appear after Lockdown in Transformers: Age of Extinction (2014). Generally, each Transformer in these films has a unique vehicle mode.

Tyrese Gibson was set to return as Robert Epps, but he was unable to appear in the film due to scheduling conflicts with The Fate of the Furious (2017).

Shia LaBeouf appeared in this film, although it was only his portrait.

This film was released a decade after the first Transformers live-action film.

This film features the myth of King Arthur. Michael Bay was previously going to direct King Arthur (2004), and had worked on that film for five years, before leaving it, due to budget issues.

While shooting in England, Mark Wahlberg spent time at St. Aidan's Church incognito, and made donations. No one knew anything until afterwards. Reverend Father Des McGiven said, "It's great that we had him in for the service, and we appreciate his generosity towards our church."

Onslaught's original alternate mode in The Transformers (1984) was an anti-aircraft truck, but this was revised to a Western Star tow truck. His green color is an homage to the Autobot Tow-Line in Transformers: Robots in Disguise (2000), who was a green tow truck.

A physical prop of Sqweeks was built at Isabela Moner's request.

This is the second Hollywood movie to be shot in Cuba after The Fate of the Furious (2017). Coincidently, Tyrese Gibson played a major role in the first three Transformers movies and in The Fast and the Furious franchise.

Steve Buscemi voiced Daytrader in this film. Michael Bay had wanted Steve Buscemi to play Agent Simmons in Transformers (2007), but he was unavailable.

The first Michael Bay film to be shown in the 1.85:1 aspect ratio since his debut film Bad Boys (1995).

Liam Garrigan (King Arthur) also played the character King Arthur in the television series Once Upon a Time (2011).

Voice actors John Goodman, Steve Buscemi, and John Turturro appeared in The Big Lebowski (1998).

Hot Rod has a French accent in the film. His voice actor Omar Sy is actually French, and is exaggerating his native Parisian accent.

Part of the film was shot at Stonehenge. Michael Bay requested to shoot an explosion on the location, but was denied, so he had a set of Stonehenge constructed to shoot the explosion.

Bulldog, the Mark IV tank Transformer, is based on the tank transformers Warpath from The Transformers (1984) (a slightly unhinged robot) and Blitzwing from Transformers: Animated (2007) (a robot who wears a helmet and monocle).

Peter Cullen, Reno Wilson, and Mark Ryan are the only actors to appear in all five live-action Transformers films, with Cullen as Optimus Prime, Wilson playing Frenzy, Mudflap, Brains, Mohawk, and Sqweeks, and Mark Ryan voicing Bumblebee, Jetfire, a military drone operator, Lockdown, and Bulldog.

Hot Rod's French accent was Michael Bay's idea, as he thought it would give Hot Rod a unique character.

Many of the scenes were filmed in the north east of England, with several streets in Newcastle Upon Tyne brought to a standstill, while scenes were completed.

Michael Bay originally wanted to pass on directing this film, but was persuaded to do one more by Peter Cullen.

It seems that this movie places Trinity College in England. It is in fact in Dublin, Ireland (during the shot of the Long Room, you can even see the famous Harp of Brian Boru, used on Ireland's Coat of Arms, the Irish Euro, and the Guinness Beer logo among other things), and houses the Book of Kells, a famous illuminated manuscript.

A portion of the Loop 303 freeway in Arizona was shut down for five days in mid June 2016 for filming.

The Decepticon Nitro was named after Nitro Zeus, the code name for a shelved American offensive plan.

Hot Rod's alternate mode in The Transformers: The Movie (1986) and The Transformers (1984) was a concept car and a Ford GT, but this was revised to a Citro├źn DS, and later a Lamborghini Centenario.

In the movie, it is revealed that the Transformers are created by Quintessa. In the original 80's comics,it was revealed that the creator of the Transformers is Primus, a god-like entity formed by the rests from a previous universe to the actual, created to fight Unicron, God of Destruction, who had almost completely destroyed the previous universe, falling into a coma after fulfilling his nature. The creation of Primus using the small survivor remnants of previous universe originated the Big Bang, and woke up Unicron from his dream, starting again his destructive commandment. Primus and Unicron fought and tried to kill each other, but in the combat, Primus realized that the fight was putting danger on the universe that he was trying to save, and decided to move the fight to the Astral Dimension. Then he created a trap for the returning to physical universe and both were trapped and fused inside giant asteroids adrift in the universe. Many millenniums later, Primus learned to convert the asteroid's surface where he was, creating Cybertron. Advertising that if he was capable to do it, Unicron's menace is not finished, Primus used his powers to create the Transformers, mechanical beings with the ability to change shape in order to take their places to kill Unicron using The Matrix (also called Matrix of Leadership), Primus' own lifeforce that he trapped in a little container, until the right time to use it to defeat Unicron.

Optimus Primal, Optimus Prime's successor in Beast Wars: Transformers (1996), was going to appear in the film as a Kight of Cybertron with a gorilla design.

This is the second Michael Bay film to have a World War II setting, after Pearl Harbor (2001).

The Knights of Cybertron have their ship hidden in a mountain range in England. The Autobots had their base in a similar location in The Transformers (1984), although that was in America.

Ken Nolan wrote the role of Sir Edmund specifically for Sir Anthony Hopkins.

The filmmakers admitted that there were production difficulties in this film, which resulted in a lot of material planned and filmed, but which never made it to the film.

Sir Anthony Hopkins is the third Marvel Cinematic Universe actor to star in a Transformers movie, after Hugo Weaving (the voice of Megatron in the first three films), and he is the second actor from the RED comic book movies to do so after John Malkovich (Bruce Brazos in Transformers: Dark of the Moon (2011)).

Omar Sy (Hot Rod) is the fourth actor from the X-Men franchise to appear in a Transformers feature. The previous three actors were Ty Olsson (Mithcell Laurio in X2: X-Men United (2003)), who played Downshift in Transformers: Energon (2004), Kelsey Grammer (Beast/Hank McCoy), and T.J. Miller (Weasel), who were both in Transformers: Age of Extinction (2014).

This is the second Transformers installment for Stanley Tucci, who played Merlin. Previously he played Joshua Joyce in Transformers: Age of Extinction (2014).

This is Jim Carter's third live-action adaptation of an animated show, movie, or book adaptation, after 102 Dalmatians (2000) and Alice in Wonderland (2010).

In the mission control room, Moving Picture Company (MPC) Visual Effects Editor Leah Jones can be seen as N.A.S.A. scientist.

Sir Anthony Hopkins and Phoebe Nicholls appeared in The Elephant Man (1980).

Despite his seeming death during Transformers: Dark of the Moon (2011), the police car Decepticon Barricade returns, and has apparently survived up to the events of this movie, with a completely new design, including a new vehicle mode.

Megatron has a new helmet design, based on his classic bucket-head look from The Transformers (1984). He was originally to have this helmet look in Transformers (2007), but the filmmakers decided it wasn't menacing enough, and passed the head design to Starscream.

Cogman is classified as a Headmaster, a Transformer that serves as a head for a larger robot. Although he does not carry this out in the film, a toy of his was released, showcasing this ability.

The film contains tributes to Transformers Prime (2010): Earth is revealed to be the planet-eating Transformer Unicron. Optimus briefly loses his identity. An ancient breed of Transformer, who can transform into a dragon appears (Predacons, Knights). The final battle is set in the sky, with the Decepticons trying to engage a machine that will destroy the Earth, and the Autobots fighting to stop them.

The Transformers' creator is Quintessa is based on the Quintessons from The Transformers (1984) (in that show the Transformers' creators, who resided on the homeworld of Quintessa), but incoporates elements of Solus Prime, a female Transformer god from Transformers Prime (2010).

Quintessa turns Optimus Prime into her minion. This is an homage to The Transformers: Dark Awakening (1986), where the Quintessons reprogrammed Optimus Prime to do their bidding.

Cade (Mark Wahlberg) and the Autobots use a junkyard as a base. This is an homage to Transformers: Robots in Disguise (2014), where the Autobots used a junkyard as a base with the help of its human owner.

Optimus Prime is only seen in vehicular mode once in the entire film.

Quintessa gives Optimus Prime the nickname "Nemesis Prime" when he initially turns evil. This is a reference to a character of the same name that is an evil clone of Optimus, which shows up from time to time in the Transformers fiction, either as a piloted mech or a different character entirely.

Vivian is a descendant of Merlin. In Arthurian legend, Vivian is the name of the Lady of the Lake.

In an alternate version of the film, Nitro Zeus tells the guard that his wife is cheating on him, but in another version he requests the guard to say, "Hi," to his wife for him. Interestingly, John DiMaggio did not play Nitro in the first version of this scene. Instead, Steven Barr, the voice of Berserker, played Nitro.

Sir Edmund (Sir Anthony Hopkins) is killed by Megatron in the same way, in reverse roles of Harold Attinger (Kelsey Grammer) killed by Optimus in Transformers: Age of Extinction (2014).

In the movie, it is mentioned that Fidel Castro allows Transformers to live in peace in Cuba. Since then, Castro died on November 25, 2016, it implies that the movie was filmed before his passing, in the way that there wasn't time to change his mention.

Optimus Prime has no on-screen transformation in the entire film. He only appears as a truck at the end of the movie.

Onslaught dies in a way similar to how Ratchet died in Age of Extinction (2014). Their right legs were blown off, and they were shot many times and had some of their parts fall off. But while Ratchet died after Lockdown ripped out his spark, Onslaught died after Drift decapitated him.