Continuity mistake: The waitress pours Xander some coffee with very shaky hands. You can see instantly Xander reach the cup and lift it, but the next shot shows him taking his time, glance suspiciously at the waitress and only then pick his coffee up. (00:13:20)
Continuity mistake: When Vin Diesel and the guy who kinda looks like him look at each other as they just woke up, Mini-Diesel's leg is at a different angle in the two shots. (00:16:35)
Continuity mistake: When XXX is hanging by his arms in the shed, just before he tells the bad guy he is short, the bad guy is holding onto XXX's shirt. In the next shot of the bad guy, he is isn't holding the shirt, yet in the next shot of XXX, the bad guy's hand is holding the shirt as before. (00:19:45)
Continuity mistake: When Xander Cage is hung up by his arms in the barn, he is hit by a man with his left hand holding a large knife in his right hand. When the man hits him again it is with his right hand, which should have the knife still in it, but it doesn't. There is no camera shot of the knife at all when the man hits Cage with his right hand, so where did it go? (00:21:00)
Revealing mistake: Xander has a XXX tattoo on the back of his neck. There are several scenes where you get a clear shot of the back of the stunt double's neck and there's no tattoo at all. Most noticeably in the scenes during the attack on the cocaine farm. (00:23:05)
Continuity mistake: When XXX has to take the second test, after he runs out of the shack where the insane guy is, he finds a dirt bike. The dirt bike changes colours 3 times. (00:23:50)
Continuity mistake: When XXX jumps with his bike at the man with the golden dentures, in the wider shot the man raises his weapon, but in the semi-POV shot his face is completely open for the bike trajectory, no weapon in sight. (00:26:05)
Character mistake: Xander is nicknamed "Triple X" by Augustus Gibbon because he is, in his words, facing a triple strike; "Grand theft auto, reckless endangerment and that little bridge stunt of yours." While there is judicial precedent of two felonies committed in the same act counting as separate strikes when the same person ended up in court for a third one, the three strikes law is designed to fight recidivism, and Xander, apparently a first time offender, wouldn't instantly be put away for life because he committed multiple crimes at the same time. Incidentally, reckless endangerment is not a crime per se in California (but 'reckless driving' is); Gibbons however is not a lawyer of the State (character mistake) and possibly could just be bluffing trying to intimidate Xander. (00:30:30)
Continuity mistake: When Xander barges into Yorgi's private section saying "Yo, I'm American", the two goons behind him are quick to hold him at gunpoint. They also hold a different position between shots (the one with long hair suddenly has his hand on his knee and the other one re-points the gun). (00:35:20)
Continuity mistake: Yorgi's henchman with the super-pointy stache beckons Xander in close-up once he hears the word "cops." In the same shot he lowers the hand he was using to gesture, but the same hand is still up beckoning in the next shot. (00:35:35)
Other mistake: When the bad guys take the cop from the bar, he starts talking to them in English and everyone is, for no reason since they are in a bar in Prague they own and he is from the local police force. In the rest of the movie it is otherwise abundantly shown when people speak a foreign language, but for that scene it wouldn't have worked. (00:35:55)
Continuity mistake: For their first meeting, Xander and Yelena entertain a very overwritten conversation taking jabs at each other. He says he'd send her to 'charm school' and she does a weird sound sucking through the teeth as she walks away. Her shawl leaves her upper bare completely bare, but at the cut, it's all the way down covering her completely. (00:39:40)
Continuity mistake: XXX meets agent Toby Lee Shavers; he is initially pestering a local female officer but then has to turn his attention to Xander. Keep an eye on the woman; she puts both hands on the computer monitor, but at the cut she is in a totally different position. (00:42:25)
Factual error: When XXX is chatting with the CIA agent sent with the package, the agent mentions that he graduated MIT 'summa cum laude'. This is impossible, as MIT does not award academic honors to graduates. (00:43:10)
Continuity mistake: In the close-up where agent Toby Lee Shavers grabs the gun from the case to show it to XXX, the owner of the hand in shot is wearing a ring on the left ring finger. In the following bit, the prematurely departed Michael Roof is sporting the ring on his right hand. The same mistake (left hand ring in close-ups, right hand ring for the other shots) happens when he picks the binoculars up and when he applies the bandage. (00:43:30)
Factual error: When Xander uses the x-ray binoculars, it is impossible for that to work. First it would have to have every single bit of each layer of what he is looking at pre-programmed in it, or it would have to determine what to see through and what to be able to see. (00:44:45)
Continuity mistake: Xander's own personal Q (Toby Lee Shavers) shows him the various gizmos; when they're done with the pervy binoculars, TLS holds up a box of band-aids. Michael Roof's hand is in a completely different position on the box between shots. (00:45:00)
Factual error: When agent Shaver shows Xander the bandage explosive for the first time he tells Xander to stand behind the wall then detonates the explosive while he is standing next to it. Agent shaver states that the explosive is powerful enough to blow a hole in a steel safe or vaporize a human. The explosive doesn't appear to be a shape charge, so the explosive force should have gone in all directions and hurt or killed agent Shaver. (00:45:35)
Continuity mistake: The wire transfer has been successful in dramatic fashion and Yorgi is telling Xander about the famous car number 10. He passes the paper to his brother; Kolya is at distance from the car, in fact he even steps away from it, to his right. But in the next shot, he winks at Xander standing by it, elbow on its roof. (00:47:20)
Other mistake: The shot of the windows falling off when agent Milan Sova touches them is repeated, it's like they are coming down a second time and not in a dramatic "replay" sort of way. Also, if the windows come down, in unison, when a guy simply taps the glass to wipe a bit of dirt off (he was not leaning on it with his body or he would have fallen as well), the building is made of playing cards, and we have seen snow in the previous scenes, which would have built more pressure on those roof windows than that guy's hand, tenfold. (00:48:15)
Answer: Xander and Shaver were back at the compound where they first met. The one where Xander finds out that Shaver is responsible for making the gun and darts that were used to knock him out. In that scene Shaver shows Xander some of the cool stuff that he had made, and Xander uses a few items later in the movie.
Rollin Garcia Jr