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.
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