Continuity mistake: After reviving Ethan after escaping from the water tank, IIsa's bra strap is visible under her tank top. When she changes later, the bra disappears. (01:10:00)
Continuity mistake: Ilsa walks across Westminster Bridge, but in the very next shot after she has crossed the bridge she is walking towards it - she should be walking away from it.
Continuity mistake: The timer towards the end doesn't match up with the elapsed time, despite being a continuous sequence. It runs fast soon after it's started, then in the final seconds the audible beeps (one per second) are mismatched with the count.
Continuity mistake: When Ethan and the girl are sliding down the rope at the opera, in one shot, as it should be, her dress is up around her neck - that is all we see - and in another shot, the dress is down around her ankles, which it shouldn't be.
Suggested correction: The top of her dress is also fluttery and could have created the illusion that her dress is up around her neck.
That's not the top of her dress we see. The top is fitted over just one shoulder, there's not enough material to cover up her shoulders and neck like it does. It's the bottom of her dress.
Continuity mistake: During the bike chase scene, Ethan chases the last rider who is trying to shoot IIsa. He follows a right bend to catch and get in the inside of this rider. Ethan then knocks him from the inside of the bend. As he is on the inside of the bend, he would be knocking the rider to the left. However, in the next shot Ethan has knocked him off on a straight road with the bike and biker now falling to the right, which would be impossible from the previous shot, with both rider and bike falling towards an embankment. In last segment the scene changes back to Ethan exiting the bend with the rider's bike travelling now in the opposite direction along the ground towards the edge of the road, before exploding when hitting the barrier. (01:16:00 - 01:17:00)
Continuity mistake: In the Vienna subway, Benji tries the glasses on and a woman and an old man approach from behind. A shot later they're suddenly already several meters ahead.
Continuity mistake: When Benji receives the opera tickets he opens the brochure completely. When the shot changes the left page is not fully extended.
Continuity mistake: In the basement, the last guy Ilsa and Ethan knock down lies sideways. A shot later he is lying face down.