Other mistake: In the slaughterhouse scene, after Harrigan has injured the Predator with his shotgun and Keyes reappears, the Predator throws its disc, and severs Keyes in half at the waist. We see his legs flop to the ground, and blood pour from above, but his upper half (torso, backpack and weaponry) mysteriously remain hovering out of sight. (According to the director, the MPAA made him cut the footage of the top half of his body hitting the ground because it was too gory, creating this odd error). (01:21:50)
Other mistake: Kevin rides down the stairs on his sled and out the door. He originally lined up the sled at the top of the stairs, but it is clear that the stairs lie to the right of the door. His sled went straight down the stairs, therefore making it impossible to go straight out the door in one movement as shown. (00:25:25)
Other mistake: In the music within the ending credits, the lyrics incorrectly state that Raph is the leader of the group when all Turtle fans past and present know it is Leo.
Other mistake: When Seagal is in the factory in Jamaica, a "Jamaican" bad guy jumps up from behind a barrel, you can see that he is in fact white - you can see the make-up line on his neck, and his wig is crooked.
Other mistake: In the scene where Jimmy and Henry try to strangle Maury with the telephone cord, the handset is off the hook, but the telephone still somehow rings.
Other mistake: When Casey's men are robbing the Triads, Abbott says "Don't move or you're dead." He then turns to his left, and while facing left, he shoots two of the red Mercedes' tires. However, he is standing directly behind the Mercedes, so it would be impossible for him to turn to his left and shoot two of the car's tires.
Other mistake: A fast editing makes a double kick on the face all the more impressive not to mention impossible. Get the pause button ready. (01:08:00)
Other mistake: When Harrison Ford returns to the crime scene to search for "evidence" we see blood stains on the carpet, which has been on the carpet for days. The blood is bright red and shows no signs of coagulation, but blood turns dark red when it coagulates after only a few hours.
Other mistake: At the very end, a plane just sitting at the gate was used to simulate one preparing to leave. The landing gear ground safety pins (with red streamers) were still installed as the engines were started, but the pins have to be removed beforehand to keep personnel clear when the engines are running.
Other mistake: In the scene where Pat walks into the empty bar, (just after Terry leaves), he shoots the owner several times. The first shot shatters the bat the owner is holding. The next couple shots hit the owner and he begins to fall, holding a bat. Fully intact.
Other mistake: Even though Mason Storm is avenging his family's slaying by corrupt cops and a politician, he has committed several crimes while doing so - he snaps the neck of a person when he has them incapacitated after a fight, then he commits 2 car jackings, then he holds someone at gunpoint, innocent or not he would have been arrested along with the conspirators for the murder and carjacking.