Revealing mistake: When 1 is running on the boat, there is a cut that shows the blue chroma key screen and the lamps used for the artificial lighting.
Other mistake: Near the end of the movie, the bad guy's yacht is tied up to a pier. Conveniently, the anchor is also deployed (why?) giving one of our heroes an opportunity to climb aboard via the chain.
Continuity mistake: In the beginning car chase there are several scenes where there is a sunroof above Ryan Reynolds' head. The Alfa Romeo Quadrafolio does not have a sunroof option. Multiple exterior shots of the car show there is indeed no sunroof. However, when they cut back to the interior, there is one.
Continuity mistake: When Rovach is the top of the building choosing new generals, the building they're on is rectangular, however when the generals are thrown over they start falling from the side of a round building (really the Aldar headquarters in Abu Dhabi). (00:56:30)
Continuity mistake: In the first minutes of the movie, one of the cars from the bad guys' infinite supply comes beside the getaway car of the protagonists. Six does what good guys in movies are always able to do; stomps harder on the gas pedal, thus sprinting ahead. We see then the car take a left turn, with the camera positioned behind a bystander with a Ronaldo shirt. But what follows is more shots of the car still driving through the road it supposedly already left (including different natural light in a POV shot). (00:04:15)
Continuity mistake: During the jewellery heist in Four's backstory, when he meets One, director Michael Bay splices in a few seconds of footage from a completely different film (and not his own). Despite supposedly being set somewhere in Europe, at one point in the escape sequence, the thieves are jumping between tower blocks in Hong Kong (and in completely different clothing). This is actually footage from Roof Culture Asia - a feature film by the parkour stunt team involved in the film (Storror).
Continuity mistake: Ben Hardy is miraculously dry when scaling the Hong Kong skyscraper, shortly after nearly drowning in the penthouse swimming pool.
Visible crew/equipment: During the rooftop battle, the camera pans left across a bad guy and onto a reflection of two crewmembers in silhouette in the colorful background. Looks like possibly Michael Bay himself (baseball cap, hands clasped behind head). (01:15:23)
Other mistake: In China after the pool explodes, everyone is dry.
Visible crew/equipment: In the beginning of the film while Ryan Reynolds is handling the eye attempting to get it to unlock the lawyer's device, a microphone operator is seen. (00:12:33)
Continuity mistake: The black BMW chasing the green Alfa crashes, only to miraculously become a Mercedes.