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.
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.
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.
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.
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).
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.
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.
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.
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.
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.
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."
Steve Buscemi voiced Daytrader in this film. Michael Bay had wanted Steve Buscemi to play Agent Simmons in Transformers (2007), but he was unavailable.
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.
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.
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).
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.
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.
Michael Bay originally wanted to pass on directing this film, but was persuaded to do one more by Peter Cullen.
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.
Voice actors John Goodman, Steve Buscemi, and John Turturro appeared in The Big Lebowski (1998).
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).
Hot Rod has a French accent in the film. His voice actor Omar Sy is actually French, and is exaggerating his native Parisian accent.
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.
A portion of the Loop 303 freeway in Arizona was shut down for five days in mid June 2016 for filming.
Hot Rod's French accent was Michael Bay's idea, as he thought it would give Hot Rod a unique character.
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. There is a Trinity College that is part of Oxford University and the film indicates the location of those scenes is Oxford.
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 Citroën DS, and later a Lamborghini Centenario.
The Decepticon Nitro Zeus was named after Nitro Zeus, the code name for a shelved American offensive plan.
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.
This is the second Michael Bay film to have a World War II setting, after Pearl Harbor (2001).
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)).
The Autobot Topsin from Transformers: Dark of the Moon (2011) appears in this film, but with a head akin to Leadfoot's, and a new name, "Volleybot".
This is the second Transformers installment for Stanley Tucci, who played Merlin. Previously he played Joshua Joyce in Transformers: Age of Extinction (2014).
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 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.
Topspin is the only wrecker that is confirmed to be still alive. Roadbuster's status is unknown, and Leadfoot is dead, as footage of him being hunted by the cemetery wind was shown in Transformers: Age of Extinction (2014).
Jim Carter (Cogman) and Phoebe Nicholls (Aunt Helen) previously worked together in ITV's Downton Abbey (2010).