Plot hole: On the plane they are told they have 2 mins to suit up, then once suited up they have a further 10 seconds before the rear door opens. 2 minutes is not enough time to put the equipment on to do the halo jump.
Continuity mistake: When Hunt and Walker extract Lane from an armoured convoy by alternate means, right after they push the truck containing Lane into the water, one of the police in the convoy tries to shoot Hunt and Walker, leaving 3 bullet holes in the front windshield of the truck. Afterwards, the bullet holes keep disappearing and reappearing when Hunt and Walker escape with the truck across Paris. The most obvious occurrence when the bullet holes disappear is when Hunt and Walker kick the front windshield of the truck to flee with a motorcycle after it gets stuck between buildings.
Revealing mistake: The helicopter that picks up Cruise after the final fight is registered as if it is Norwegian, even though they're supposed to be in India. The scene was filmed in Norway.
Continuity mistake: When Ethan is chasing Walker up the brick tower, the hatch to the roof is in the middle of the tower when seen from the inside. However, in the exterior shot, we see that there is no hatch where Ethan is pretending to be exiting. Later we see the exit to the roof is on the side of the building.Kgprophet72
Continuity mistake: In the bike chase, Ethan has side mirrors in all but one scene where he is surrounded by police coming from all corners. The bike's mirrors are missing then. (00:59:10)