Continuity mistake: At the start when we see the Jeep approaching the blockade on the bridge, the position of the 4 men change instantly. Note the white line. (00:04:25)
Continuity mistake: When Hobbs asks where Shaw is at the very start, the distance between the 2 men changes instantly. (00:05:45)
Factual error: In the scene where Shaw is talking to a goon while fixing his car he states the simplest things cause the most problems while holding a spark plug. We know this can't be right as Brian concludes the car is a turbo diesel like a Le Mans car, which would actually use a glow plug and not a spark plug. (00:19:50)
Revealing mistake: Just as the buggy flips Brian's car, it does a handbrake turn and on the ground are tyre marks from a previous take. (00:27:30)
Continuity mistake: Roman removes a 100 Grand bar from the shot-down vending machine. In the close-up shot, there are several other 100 Grand bars visible. One of them is held by springs on both sides, with the left side slightly raised. In the next shot, that specific bar has vanished from the pile. (00:34:10)
Factual error: Roman is searching through the shot-down vending machine after the massive chase. Two of the products shown in the machine are a couple of Nestle 100 Grand bars and a couple of Nestle Butterfingers bars. This scene takes place in the UK - 100 Grand bars and Butterfingers bars aren't available in vending machines in the UK, just specialist sweet shops. (00:34:10)
Continuity mistake: After the first big action sequence in London, the gang meets back in their HQ to discuss the next course of action. During this scene, Gina Carano has her hands hooked into her belt/pockets, when during various camera changes, she's got her hands around her in a hugging motion, then back to her belt/pockets. (00:35:00)
Continuity mistake: Tej tells Hobbs he's got this, and the scene changes to establishing shots around London. The first shot shows a shot of London, featuring many landmarks and Big Ben in the background. The time in the first shot is 2:10. The shot changes with the camera closer to Big Ben and the time is suddenly 3:00. (00:36:25)
Character mistake: Tej mentions that the BMWs they used were factory-line, ie. unmodified. Hobbs then says that they were twin-turbo V8s "spitting out 560 ponies". The BMW M5s they have are E60 models (2005-2010) powered by a naturally aspirated 5.0 liter V10, producing 507 horsepower. (00:38:30)
Continuity mistake: At the shoot out, Gisele is talking with the wounded man who made the gadgets. He has a small amount of blood spilling out of his mouth, down the side of his cheek. A couple of shots later, the blood is now a long streak down his cheek. Then it is suddenly just a tiny smear of blood around the edge of his mouth. (00:46:20)
Factual error: The range rover has a UK 'PE60 EKJ' number plate indicating it's a late 2010 car. It's a 2002-2005 model. (00:48:00)
Continuity mistake: When Brian is taken into the prison by 2 guards his jumpsuit comes open. As he is being dragged through the door it is now closed again. (00:56:00)
Factual error: In the scene of Paul Walker getting off a plane in an orange prison jumpsuit escorted by U. S. Marshals, the jackets worn by the Marshals have the misspelling "Marshall" printed on them. (00:56:45)
Continuity mistake: When Dom and Letty are talking on the start line ready for their race, Dom's right arm is either on the passenger seat or down depending on the shot. (01:03:20)
Continuity mistake: When Dom runs against Letty the space between the cars and the girl who starts the race changes between shots. (01:04:00)
Revealing mistake: When Letty slides her Interceptor around the statue during her race with Dom, you can see skidmarks on the ground from previous attempts. (01:06:00)
Visible crew/equipment: When Letty and Dom are racing through London, you can see crowd control fences along quite a few of the sidewalks, especially when they are at Picadilly Circus. (01:07:40)
Continuity mistake: In the first movie, Mia tells Brian that Letty lived down the road, was into cars since she was 10 and immediately had Dom's attention, but here Dom tells Letty that he gave her her first scar at age 15, when they first met. (01:08:00 - 01:09:00)
Continuity mistake: When Dom hands the cross to Letty, the chain is dangling. Camera cuts and now the dangling part of the chain has disappeared. (01:10:30)
Continuity mistake: Throughout the entire movie, Hobbs has a goatee. But when Hobbs is driving and talking on the phone to Tej, his goatee is gone. In Hobbs' next scene, the goatee is suddenly back again. (01:22:35 - 01:23:55)
Suggested correction: That's exactly the problem that Shaw is referring to, a member of his team installed the incorrect plug which caused a problem, i.e. a Spark Plug and not a Glow Plug (a simple thing, causing the problem), along with the 'good' being simple minded and causing the rest of Shaw's team a problem.
The glow plug isn't what causes combustion in a diesel like how a sparkplug does for gas. The wiring harness for a spark plug vs a glow plug is completely different and they aren't interchangeable. You can't just accidentally put a spark plug in a diesel, it doesn't work like that.