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)
Factual error: Hobbs would not be able to walk around London with a holstered gun on show, despite his position in the USA.
Continuity mistake: When Dom goes to the street race it shows him watching Letty, Letty walks over to her car and the top is down, she starts to walk around the car, the shot cuts and suddenly the top is up.
Suggested correction: Letty first walks over to a car she just won with the top down (a Spyker), then closes the door of that car and then walks to her own car (Jensen Interceptor).
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.