Continuity mistake: Shortly before Hallam leaves the basement he is seen running along in a black shirt and without a helmet, with Bonham on his heels. From one shot to the next he is wearing a thick brown jacket and a red helmet, not anything he would put on running along to facilitate his escape. (01:02:30)
Continuity mistake: When Bonham follows Hallam through downtown Portland, shortly before Hallam hides behind the Budget truck, Bonham overtakes a blond lady in a rather unbecoming black-and-white sweater twice. (01:03:50)
Continuity mistake: When Hallam hides behind a Budget truck Bonham loses him for a moment. He stands there looking around, and while he does that he gets transferred from a completely built-up area to a park where he can spot tracks in the lawn (somehow identifiable as Hallam's). (01:04:15)
Factual error: In all the scene setting shots of downtown Portland there are always sirens wailing and car horns blaring to make it sound like a big city. Portland just doesn't sound like that. (01:06:00)
Factual error: Lots of liberties are taken with the geography of downtown Portland. For example, at one point Bonham is standing on a fountain looking around and, from his point of view, you see two MAX trains on a slope going past a parking lot. Those two points are about a mile apart and there is definitely not line of sight between them because most of downtown Portland is in the way. (01:07:40)
Other mistake: When Bonham climbs on the train we see in the back that the bridge has a ramp, which can be passed by cars but not by a train. (The fact that it's the wrong bridge has been mentioned already, but the ramp reveals this even to non-Portlanders.) (01:08:20)
Continuity mistake: Hallam hops from the roof of the train on to the steel construction of the bridge. He is seen climbing up a curved, flat beam, but when the camera angle changes he is running up stairs with a railing. In a later areal shot the curved beam isn't there. (01:09:45)
Factual error: When Hallam is trying to get on the train, the policeman says the subject is on the Hawthorne Bridge. The MAX light railway doesn't go over that bridge, it goes over the Steel Bridge. (01:10:00)
Continuity mistake: When Bonham follows Hallam down the river he is seen walking on the right bank. In the next shot he is walking on the left bank. (One could assume that he is going back and forth, but that would be very counterproductive on the hunt for someone who is swimming down a fast-flowing river). (01:12:00)
Continuity mistake: In the short aerial shot of Hallam and Bonham climbing up the bridge there is no train on the bridge below them. (01:13:08)
Other mistake: On the final hunt, both Bonham and Hallam sit down and produce knives in a very diligent manner, Bonham from a flintstone, and Hallam from a piece of scrap metal in a complete forging procedure. Given the time pressure both opponents are under, this display of stone- resp. iron-age skills (a.k.a. survival skills) is a bit absurd and almost touching. (01:13:50)
Continuity mistake: When Tommy Lee Jones is pursuing Benicio Del Toro under the city his shirt is wet almost all the way to his trousers, when he gets out of the hole its wet only on the top of his back. (01:14:49)
Continuity mistake: When Bonham steps into Hallam's trap and goes down the cliff doing a bungee jump there are huge trees right next to the trap. Seen from below there are no trees. (01:17:20)
Continuity mistake: Near the end, when Tommy Lee Jones is hanging upside-down over the raging river, he pulls the wooden stake out of his leg. Blood starts gushing out and it leaves a pretty big hole in his thigh. Yet during his end fight with Del Toro, there is no marks on either thigh. (01:19:20)
Continuity mistake: When Tommy Lee Jones is reading the letter at the end of the movie, there is no signs of scar tissue on his hand, even tough he was cut there during his last fight with Benicio Del Toro.
Revealing mistake: When the "light rail" vehicle is crossing the bridge, several shots reveal that it is not traveling on rails, but on a metal grating. This is most obvious after the police have stopped it. We see a bridge deck designed to carry cars & trucks (in fact, the police have just driven out on it) with strips of metal laid on the surface to simulate "rails". As others have observed, this was filmed on the wrong bridge; this makes it particularly obvious.
Factual error: After Del Toro jumps into the (Willamette) river he floats/swims to the falls. In fact those falls are about 10 miles upstream from the point he jumps in.
Continuity mistake: When Tommy Lee Jones is pursuing Benicio Del Toro in the river, he gets very wet. In the next shot his hair and clothes are dry and clean.
Revealing mistake: In the shot where Jones is caught in a snare and is falling through the air towards the water, he comes to an unnatural stop at the end of his fall. He should have jerked when he came to the end of the rope. Instead, he came to a smooth, controlled stop with no jerking or bouncing. The stunt man was probably lowered with a crane.
Revealing mistake: In the scene where the two "deer" hunters are shooting at Del Toro, the report of the rifles is wrong. The report they use in the movie is for a semi-automatic weapon; you can hear the mechanical clang at the end. These hunters were shooting bolt action rifles.