Continuity mistake: In the hotel scene when Van Damme is crashing through walls to escape the other Universal Soldiers who are shooting from outside, one shot from the inside of the room shows him hitting the wall with his left shoulder, but when the camera goes into the next room to show him coming through that wall, he is breaking through with his right shoulder.
Continuity mistake: When Luc Deveraux and Veronica Roberts are on the prison bus and Andrew Scott is chasing them on the truck/base of operations Andrew starts throwing hand grenades. Andrew throws one that lands inside the bus. Veronica has time to fumble around for it, pick it up, scream about it and throw it out of the window before it explodes. The rest of the grenades that Andrew throws explode in a couple of seconds like they are supposed to.
Continuity mistake: In one scene JCVD is trapped in the back of an out of control prison bus. The driver has been killed but has, one must assume, died with his foot jammed on the pedal because the bus doesn't slow. In a shot facing back at the bus you can clearly see a pair of hands steering the bus.
Continuity mistake: When the Unisols first show up at the dam, the colonel is wearing a 11th armored cav patch on his left sleeve and a Special Forces patch on the right. In the next shot he is wearing a 11th cav patch and no SF patch, then a SF patch on the left sleeve and nothing on the right, then they switch (SF on the left and 11th cav on the right). This continues throughout the movie.
Deliberate mistake: At the start of the movie when the articulated truck is leaving the aircraft, you never see the attached trailer until the truck is completely flat on the runway. This is because of the steepness of the loading ramp, the trailer would ground and get stuck on the ramp.
Continuity mistake: After the big chase scene with Luc and Veronica in the prison bus, and Sgt Scott has seemingly been killed, Luc and Veronica knock out the Sheriff and take his car. The car they take is a white car with blue lines on the side, the word "Sheriff" stencilled on the back wing and large flashing lights on top. In the next scene when they arrive at Luc's family's home, the car is still white with blue lines, but has no lights on top or writing on the wings, and has a totally different bumper on the front.
Continuity mistake: When Lundgren bombs the prison bus, the aerial shots and the close-ups have nothing in common: In the aerial the bus is in a very narrow space next to a huge cliff, with nothing around but sand and rocks. In the first close-up the bus is rolling in a wide field, no sign of the cliff. In the second close-up a wooden fence and a house-shaped sign suddenly appear, only to disappear in the third close-up.
Other mistake: Devereux and Scott are sent after the reporter to apprehend her. Only problem with that is moments before they were sent to go get her, they were naked having their injections, there wasn't enough time for them to have kitted up and gone after her with any hope of catching her.