Continuity mistake: During the bridge scene, soldiers approach the armoured vehicle to spray it with orange gel. As they approach, the vehicle has a triangular reflector on the rear side. In the shot five seconds later showing the orange gel being sprayed, the rear reflector is circular.
Continuity mistake: In the scene in Berlin, the female member of the IMF team starts with no special glasses/goggles, then has them up on her head, then, just before the shooting begins, she puts them over her eyes, but later, while the shooting is still going on, they are back up on top of her head. Then they completely disappear.
Factual error: In the scene where Davian gets hit by a truck, there is a shot of a taxi afterwards. The Chinese characters read 'bus' rather than 'taxi'.
Factual error: In the Shanghai scene, the shot immediately following Ethan's parachute getting caught on the light post shows a tall skyscraper with a pyramid peak in the background. This tower is called Tomorrow Square, located in the Jing'An District, and is nowhere near the Pudong financial district where all action is supposed to be happening.
Continuity mistake: When Davian and Hunt are fighting in front of Julia, Davian slugs Hunt on the floor and walks for the gun. Hunt is twice seen lying on a floor with no glass, the second shot a close-up showing his face and clean arm. In the next shot, as Hunt rallies and goes to rise from the same body position, he's lying in piles of glass and has glass stuck to his arm.
Continuity mistake: Towards the end of the film, after Tom has been electrocuted to destroy the bomb implanted into his skull, we see the female lead trying to restart his heart, each time they show his eyes, they are closed or open in different shots, and if they are closed, you can see his eyeball moving underneath the eyelid.
Deliberate mistake: Ethan draws the outlines of the buildings on the window. But the drawings line up with the real buildings from the camera's viewpoint, not as Ethan would see them.
Continuity mistake: In the bridge scene Ethan runs to the IMF truck to retrieve the G36 gun case. He shoves it out across the ground and flees to escape the approaching missile. When the missile strikes, the explosion knocks Ethan against a car, and the gun case is blown further across the ground and appears to come to rest right next to him; yet in the next shot he has to run several steps to get to it.