In the first fight scene in the alleyway that Jack and Wang witness, the same stuntman can be seen charging, fighting, and indeed being KO'd alternately dressed as a Chang Sing, or Wing Kong.
During the fight between the two Chinese gangs, Jack and Wang are sitting in the truck's cabin. But in external shots of the truck, there's nobody inside.
When Jack, Wang et al exit the Wing Kong Import/Export Exchange Company, Uncle Choo is waiting outside in a yellow bus. Wing Kong security then open fire on the bus as it drives away. However, as the bus turns a corner seconds later you can see that there aren't any bullet holes or broken windows on the side of the bus they were shooting.
When Jack and Wang are rescuing the girls and a fight breaks out in the white plaster storage area, they use the same shot twice when one of the bad guys is kicked and lands on a table against a wall.
When Jack Burton is explaining what happened in the alley, he mentions that Lo Pan had "light coming out of his mouth". However, Jack could not have seen this, as he was already temporarily blinded by the light from Lo Pan's eyes, and had his hands over his eyes by the time the light came out of Lo Pan's mouth.
Although the Three Storms are Chinese, when they reply to Lo Pan's commands, they answer hi, with "Hai", which is Japanese for "Yes".
When The Three Storms confront the gangs in the street, they brandish and throw Kukri knives at the gang members. Kukri are not a traditional Chinese weapon, but Indian/Nepalese.
Jack Burton (Kurt Russell) fires a TEC-9 semi automatic pistol and its sound is deep low-pitched in real life. However the sound FX used is sharp like a old western revolver.
Our heroes slide down into a storage room the Wing Kongs store piles of fish used as food provisions. The room is obviously room temperature and fish does not stay fresh long and yet nothing appears rotten and a Chang Sing even bites the head off of one and offers it to Burton.
When Kurt Russell is pulling himself up on the wheelchair from falling into the well, you can clearly see an effects hinge under the chair that is actually pulling the chair back up, even though it appears as though Jack Burton is doing this with pure strength.
Obvious fake knife that Jack holds between his teeth.
During the first stage of the fight between the Chang Sings and Wing Kongs in the alley, one of the fighters is hit to the ground and you can see the asphalt flex revealing the crash pad underneath.
When Egg serves his magic potion to Jack and the rest of his warriors in Lopan's bar, you can see that his goblet has ice all over its bottom half, showing that they used dry ice to make the goblets steam and bubble.
During her first scene at the airport, the color contacts on Gracie's "green" eyes are sometimes visibly out of place (look at her right eye when she turns to Jack after asking "what are they doing here?").
In the alley while they are sitting in truck during gang fight, the truck doesn't sustain bullet holes even though gang member hiding directly next to driver's side front tire & gets machine gunned down. They show the shooter spraying bullets left to right and not direct. The truck would have been splattered with bullets too. Especially the way they show the wheel turned outwardly. It would have been flat. Yet the truck remains without bullet holes.
Also, they show shooter firing the first gunshot with the gun at the same height as jack's window yet the truck windows are higher than even the shooter. So it would be impossible to naturally shoot a handgun at that height. His window would of had to be car height. Or the shooter unnaturally shot gun with arm fully extended upward over his head for It to be same height.
The USA DVD from 2002 has incorrect English subtitles that does not fully complete the exact English spoken script.
In the scene where Jack and Wayne are driving thru Chinatown Jack stops to ask the older Chinese lady for directions beforehand she is shown chopping up meat on her balcony but when the camera points to what she was chopping the animal is clearly still intact and not cut up at all..
Jack's truck has an overhead pull line for his air horn (seen on-screen when the Puma truck cuts them off). Early in the film, when Jack is pulling into the Chinese market, you can clearly see that he's *not* pulling that line when the truck's horn sounds.
When Jack shoots the lock off of the first line of cages his gun fires twice before the first sound of a gunshot is heard, then at least three more times, again with only one gunshot heard.
When Jack Burton is kicked through the air by one of the three storms, padding can be seen through the shirt of the stuntman before he hits the chair.
When Jack Burton rolls backwards in the wheel chair that stops and is teetering on the edge of falling into a well, you can clearly see the wires holding the chair in place to keep it from falling.
Gracie says she would be with Jack if he traded in his truck for one with a little apartment in the back. However, the Pork Chop Express did have an apartment in the back, as evidenced by the large section behind the cab and the curtain separating the cab from the apartment.
Jack describes Lo Pan as being able to shoot light out of his mouth, but when Jack encounters Lo Pan in the alley after running through him with his truck, Lo Pan shoots light from his eyes before light comes out of mouth. Since Jack was already blinded by the light from Lo Pan's eyes he couldn't possibly have seen the light come out of Lo Pan's mouth.