Continuity mistake: During the Job 3:14 scene, Ethan places the Bible parallel to the laptop and the gun. In the close-up angle it always appears that way, but in wider angles the laptop is slightly slanted. (00:34:15)
Continuity mistake: As the firefighters are entering Langley they mention they need to shutdown the air conditioning. The guard states that the aircon is in sector 21 that has no alarm. Luther 'helps' by triggering the alarm in that sector. A while later when Kittridge is talking to his people in the ops room you can see that the alarm is active in the 3 sectors as the guard mentioned but now sector 21 is missing. (00:57:30)
Continuity mistake: When the "firemen" (Ethan Hunt, Claire Phelps, Luther Stickell and Franz Krieger) leave Langley, Claire is in a red coat and red dress. As we see all four drive off in a fire truck, Claire is in a fireman's costume. Firstly, when did she have the time to change and secondly, why change? (01:08:00 - 01:10:00)
Continuity mistake: When Gene is handed the watch in London, the way he holds it changes depending on the angle. (01:25:10)
Continuity mistake: At the end of the film, Ethan drops his mask. His hair looks flat and wet. At the next shot it's dry and up. (01:34:20)
Continuity mistake: At the end, Ethan is drinking a pint and leaves a little left in the glass. This little bit of drink then vanishes is subsequent shots. (01:40:30)
Continuity mistake: Besides the fact that during the final action sequence it is impossible for two trains to occupy the same tunnel, how is it that the blades of the helicopter attached to the first train don't strike the second? Tight fit.
Continuity mistake: In the scene where Ethan is in the NOC list room Krieger starts to drop him and Ethan is hanging there for a little while. Suddenly some sweat starts to drip down his glasses and he catches the drop with his hand. If you look at how close he is to the floor this move would be impossible.
Continuity mistake: The train is electric, supplied by overhead cables, which do not appear to be present at any time. If it was a Eurostar then it could use 3rd rail pick-up but it wouldn't be going so fast, but that's academic; its not a Eurostar and no 3rd rail is visible either.
Continuity mistake: When Tom goes to the restaurant to meet with Henry Czerny, the plants in the aquarium are noticeably different after he goes inside.
Continuity mistake: At the end of the movie, when Ethan and Luther are sitting at the pub, just after the cheers/here's to you speech, Luther said "Hey, I'm flavour of the month" and brings his glass up to his lips for a drink. In a split second cut to a wide shot facing Luther his glass is on the table, and there are only two glasses on the table as established in a wide shot where Ethan says, "I'd better go catch my flight."
Continuity mistake: In the scene where Jim, Claire and Ethan are in the baggage car of the train Claire takes the money off of Ethan, the money is not folded in any way. However, in the next shot where she passes the money to Jim it is suddenly folded conveniently to fit into Jim's pouch.
Continuity mistake: When Claire finds Ethan disguised as Jim, he has his normal hands. However, in all previous scenes of him in disguise, he has fake hands as well, that are wrinkled like Jim's.
Answer: I disagree with the other answers. I watched it in slow motion and thought he was going for the kill. There would be minimal struggle since Ethan isn't in a fighting position and Krieger was inches from his throat with the knife before he dropped it. He wouldn't care if there's a lock down because he would be out by the time they notice Ethan's body above. I guess blood spilling would give it away, but he'd still be out and under cover before anything can be done. He doesn't have to know who Max is or how to contact her he's working with Claire and Phelps. Luther wouldn't care too much because he just met them. At most all they have to say is that there was an accident and Ethan didn't make it. Max wouldn't care because she just wants the real list. If Ethan dies early the bad guys win and IMF will think hey he was the mole and got double crossed. There is 0 reason for Krieger to not kill him at that moment. He has the disc and that's all he needs.
Job as Jim lost confidence of Max. The deal was with Ethan. Ethan had to survive.