When Letty and Mia are eating in Tokyo, the same couple passes them twice.
Tej and Roman fight 4 guys in the back of the magnet truck. When they open the door and throw people out, two of the bad guys (the ones in gray clothing who were inside originally) have disappeared.
When young Dom and Jakob find Kenny Linder at the car remains, Dom's necklace shifts from outside his shirt, in two different positions, to underneath Dom's shirt.
None of the vehicles take on any damage while military rockets are exploding right next them.
As Tej, Roman and Ramsey are shown driving over a collapsing bridge, Tej "shifts" several times for no obvious reason. In one shot the transmission appears to be in Park, which would make it impossible to drive.
The devices referred to as electromagnets perform feats that are not possible for such a device, including violently repelling cars. Real electromagnets can't repel objects or attract objects only from one direction, and the power requirements and heat generated by an electromagnet capable of pulling a car from just a few inches away have been completely ignored. The devices are not realistic in any way and can only be explained by magic.
During the car chase in London, the police cars have sirens not used in the UK. They are what the US associate with Europe.
In the Edinburgh scenes, Dom's car is shown without a front number plate. It is a legal requirement in the UK to have visible plates front and rear.
The vehicle registration VC654RQ the drive in the Edinburgh square is an illegal format that would have been picked up by ANPR.
The car that the main characters are driving in London when they first arrive is an Acura NSX. This is incorrect because this car is only sold with an Acura badge in the United States, and in London would have been badged as a Honda NSX - or, rather, it would be if it was a UK-market NSX. Given its left-hand-drive layout, along with the fact that Dom and his crew imported at least a half-dozen North American-market vehicles to Europe (including Han's brand-new Toyota Supra), they could've covertly imported the NSX as well.
The fictional country of Montequinto, where the movie's opening action sequence takes place, is set somewhere in Central America or northern South America and features extremely high cliffs alongside massive karst-rock formations. Nothing remotely similar exists anywhere in the Americas: such formations exist only in parts of Thailand, Vietnam and the Philippines. (The sequence was shot in Thailand.)
When Tej and Ramsey prank Roman by turning on the magnet, they hold down their own electronics. Given the strength of the magnet, this wouldn't actually help in reality.
When Queenie is driving Dom through London in the Noble M600, she asks him to pull the "e-brake". Queenie, being British, would call it the handbrake not e-brake (emergency brake) especially with it being a hand operated brake in this car. This seems more an American term than British.
In their first conversation of the film, Cipher mentions the name Qasar Khan to Jacob, saying that he was Genghis Khan's brother and that "nobody's heard of him either." The line is obviously meant to provoke Jacob by implying that he is living in Dom's shadow, but Qasar (or Hasar) is far from unknown. While not as famous as his brother (especially in the West), he was a renowned historical figure in his own right, with many living descendants, and a memorial hall where annual sacrificial ceremonies are performed in his honor.
In the 35th minute and onward, the clock on the wall is upside down and shows 5:42.
Jack Toretto's final race takes place in 1989. However, the entire field is comprised of Chevrolet Monte Carlo and Pontiac Grand Prix bodies that are based on models from the late '90s and early 2000s.
When Tej clotheslines one of the uniformed goons out of the truck, there are still 3 goons left in the truck, Roman then tosses the second uniformed goon out and the truck is shown to be empty of anyone but Tej, Roman, and Ramsey.
When the women walked into the apartment in Tokyo in which a Mexican flag had been hanging in a window, they did not take a step up into the apartment after entering the door. Although various details of the set, including the light switch and metallic kitchen sink were accurate, no apartment--no matter how old or new--in Tokyo would lack a genkan, where shoes would be kept below the level of the rest of the apartment or house.
Although the broad strokes of the Edinburgh car chase make sense and are edited coherently, locals are likely to notice some oddities. In particular a bit of poetic license is taken with the length of the streets, which is something of a franchise tradition.
While blasting a jerry-rigged Pontiac Fiero off of the back of an airplane into outer space is already implausible, Tej and Roman ending up in the Earth's orbit only a short distance from both the enemy satellite and, later, the International Space Station is truly impossible.
In the beginning of the film they say they are going to find and rescue Mr. Nobody, yet they never do.
There would be no way for Han to somehow get out of the flipped Mazda RX-7 without anyone noticing him in the first place, given that in The Fast and the Furious: Tokyo Drift (2006), he struggled to get out of the car before it exploded and presumably killed him.
Without being harnessed in a 6-point racing harness, there is no way that both Dom and Letty not only survived being thrown across the ravine in South America, but also managed to remain in the car despite it rolling some 6 times.
In The Fast and the Furious (2001) Dom tells Brian that he beat his dad's killer with a torque wrench. Here it's clearly seen to be a pipe wrench.
When the group is being briefed by Ramses on Project Aries, Tej interjects "Aries is the god of war, right?" Aries is the first astrological sign in the zodiac, and is Latin for "ram." Ares is the Greek god of war.