Continuity mistake: In the scene when Yuri's daughter is getting away from the hotel, the color of the chopper changes from green to brown between shots.
Continuity mistake: Throughout the blue van chase, the damage to the van is constantly changing/repairing itself.
Continuity mistake: When John and Jack are discussing if he meant Chernobyl, the blood on Jack's face disappears instantly. (01:00:50)
Continuity mistake: At the end, Jack and John fall into the pond and get soaked. As they walk out of the building their clothes are completely dry. (01:29:15)
Continuity mistake: During the chase with the blue van, it keeps changing model. Starts with a van with high roof, than low roof, high roof again. And this goes on and on.
Continuity mistake: At the end, the wreckage of the helicopter changes position instantly. Note the position where the rotor blades are. In one shot they are on the side, then on top. (01:29:35)
Continuity mistake: In the car chase, the blue van is hit and the left side headlight dislodges and is dangling down for most of the chase. But in one far shot where the van is taking a turn, it is suddenly switched to the right headlight that's dangling. (00:23:00)
Continuity mistake: During the opening chase the chase goes along the river from left to right as you look at the screen. They make a turn and now go from right to left as you look at the screen, along the same river.
Continuity mistake: The mobile tank rips a door nearly completely off a blue van. When John hits it, there is less damage to the door. (00:22:50)
Continuity mistake: When we first see John, he is in the police shooting range. He has on protective head phones which he takes off and sets on the table in front of him as the other cop comes in. He and this cop talk about Jack, and when they finish, they shake hands. The mid range shot of them shaking hands shows the head phones still on the table. It then cuts to a far shot and now the head phones are gone while the two finish the hand shake. Careful which table you are looking at, as the angle makes it confusing. The head phones were on the table with the red thing on its left side. (00:06:50)
Continuity mistake: When John gets out of the taxi, the window is open. When he closes the door, the window is shut. (00:12:00)
Continuity mistake: When John is in the taxi in Moscow, there is one shot of the taxi with a sticker in a bottom corner which disappears.
Continuity mistake: When John and Yuri are standing in front of the crane and talking about their children, John's arms go from crossed to by his side, back to crossed a couple times between shots. (00:39:35)
Continuity mistake: When Jack and Yuri escape from the courthouse, both have their hands cuffed. After getting in the blue van for the first time, they still have the cuffs on each hand, but they are no longer chained together. (00:19:00)
Continuity mistake: When the masseur starts to strangle Viktor, he drops his phone. When the camera angle changes, the phone is 10 feet away from them.
Continuity mistake: When John and Jack steal a car to go to Chernobyl, the trunk had guns in it, but no black vests, which is what they find the second time they open the trunk, at Chernobyl.
Continuity mistake: When being shot at by the helicopter in the hotel room, the scaffolding that John and Jack make a run for is not visible from the outside shots (to the left of the building).
Continuity mistake: During the opening chase we have a long shot of the blue van turning left onto the main road next to the river - the next shot is the armoured truck doing the same, but in close up the road layout is completely different, and yet they are right behind the blue van.
Continuity mistake: When Jack McClane gets his dad from the burning room at the end, he enters wearing a flak jacket and leaves without it, without enough time to take it off, they then leap into the pool.
Continuity mistake: In the car chase near the start, the blue and white cars hit bumper to door. When the tank type car hits them they are end to end. (00:22:00)
Chosen answer: The ring road around the center of Moscow.
Friso94