Blooper

In the Chicago sequence, Jimmy and Jagger are chasing one of the white supremacists through town and they pass the same man twice.

When Mister Keyes fights the corrupt police officers, his shoes go from brown boots to brown basketball shoes and back between shots.

The blue van alternates from shot to shot between two very different models. A 1971 GMC Vandura is depicted as being unloaded off the airplane, but a 1968 Chevrolet Chevy Van is shown arriving at the dam site with dents in the side door. Note the completely different side doors as well, and each is a noticeably different shade of blue.

When Jimmy is talking to Wendy from the phone booth he is clearly inside the booth while the gravel truck is charging the booth (0:54:04).Yet,seconds after the gravel truck hits the booth Jimmy isn't inside the booth and he is hanging from the back of the truck instead(0:54:09).

At the shoot-out around the dam site, the scenes go from being at night to night-for-day shots and back again. (What appears to be snow is actually concrete covering the rocks to prevent erosion around the dam.)

When Mister Keyes is fighting the cops in the street, there are already sets of skid marks on the pavement in the exact same spots where two different police cars skid and slide sideways to a stop - from a previous take, evidently.

In the opening scene, two of the "dead" men are very visibly breathing or moving.

When Jimmy Lait is being chased by cars in the parking garage, one of the cars explodes (from the cabin) as it goes over the wall instead of when it hits the ground (as the other car does).

In the fight with the cops on the street, Mister Keyes (Jim Kelly) is too obviously pulling his punches and kicks, etc.

Dr. Fortrero states that, like sickle-cell anemia, his race-specific toxin doesn't affect Caucasians. Sickle-cell anemia is a genetic condition that can affect anyone, it is just more common in populations with origins in parts of the world in which malaria is common (such as sub-Saharan Africa) because being a carrier for the disease confers some resistance to the malaria parasite.