Visible crew/equipment: When Xander and Yelena are in the restaurant and they are shown through the window from outside you can see the reflection of a film crew member in the window.

Revealing: There was an explosion before the senator's Corvette hit the ground.

Continuity: In the part where 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.

Factual error: Xander puts a load of those sticky bombs on a line of motorbikes outside the bad guy's house. These bombs had a detonator switch, which Xander has. When he eventually sets them off, the motorbikes blow up in the order that he put the bombs on. These bombs didn't have timers or anything on them, so why would they blow up one by one and not all at the same time?

Plot hole: Towards the end of the film they resolve they must destroy the submarine and hence all of Prague to save the world - Why oh why does Samuel L. Jackson, and all the other executives, drive to the middle of the soon to be destroyed city? It seems a waste that such important people would be willing to die for no good reason, especially considering they had 30 minutes to get away and weren't even aware at first that Xander was actually on the sub.

Revealing: 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.

Continuity: When XXX is snowboarding down the mountain in front of the avalanche his goggles change from round to rectangular back to round again.

Continuity: When XXX steals the Corvette, we see he breaks one of the side view mirrors. On the following shot we can quickly see that one side view mirror is broken and the other one is not. Then when XXX starts talking we see that both mirrors are broken.

Revealing: In the scene where Ahab was just launched and XXX and Yelena are running, Yelena's singlet top changes from blue, to white, then back to blue again in different shots.

Factual error: In the very beginning, where the first agent gets killed, the Russian guy that shoots him says, "Zaraza" which means "bastard" in Russian. The subtitles say "I see him."

Continuity: When Xander throws grenades to make an avalanche he unzips his coat. He fixes his goggles and jumps. In next scene his coat is already zipped up. Clearly he didn't have time to zip it.