With a budget of $217 million, this is the most expensive Transformers film to date.
The scenes of Sir Edmund Burton visiting 10 Downing Street were filmed at the actual office of the British Prime Minister in October 2016.
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.
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.
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.
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.
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. Director Michael Bay liked them so much that he decided to incorporate them into the script for this 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 director Michael Bay got Carter on as Cogman.
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).
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 & Furious franchise.
Quintessa's design is based on Alpha Q's design in Transformers: Energon (2004) (a humanoid upper body with tentacles for legs), 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.
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.
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.
Voice actors John Goodman, Steve Buscemi and John Turturro had all starred together in in The Big Lebowski (1998).
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 Buscemi was unavailable.
This film features the myth of King Arthur. Director 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. Director 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.
Hot Rod has a French accent in the film. His voice actor Omar Sy is actually French, and is exaggerating his native Parisian accent.
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's French accent was director Michael Bay's idea, as he thought it would give Hot Rod a unique character.
Peter Cullen, Reno Wilson and Mark Ryan are the only actors to appear in all five 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.
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.
This is the second Michael Bay film to have a World War II setting, after Pearl Harbor (2001).
A portion of the Loop 303 freeway in Arizona was shut down for 5 days in mid June 2016 for filming.
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 was named after Nitro Zeus, the code name for a shelved American offensive plan.
This is the first Transformers movie where Megatron refers to a human by name, in this case being Cade Yeager, the mechanic who found Optimus in the last film.
Sir Anthony Hopkins reprised his role as the Norse god Odin in Thor: Ragnarok (2017), the same year this film was released. Frank Welker had previously played Odin in Avengers Assemble (2013).
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.
Michael Bay originally wanted to pass on directing this film, but was persuaded to do one more by Peter Cullen himself.
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.
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 X-Men 2 (2003)), who played Downshift in Transformers: Energon (2004), and Kelsey Grammer (Beast/Hank McCoy) and T.J. Miller (Weasel), who were both in Transformers: Age of Extinction (2014).
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 Jim Carter's third live-action adaptation of a cartoon, after 102 Dalmatians (2000) and Alice in Wonderland (2010).
Anthony Hopkins and Phoebe Nicholls both previously starred in The Elephant Man (1980).
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