Continuity mistake: In a matter of 15 seconds between David's ship exiting the hangar and shooting 20 miles upwards into space, shadows on the ground indicate very different positions of the sun. (00:51:05)
Factual error: Calendar date at the very beginning of the film (in the police station), shows the dates of Saturday 20th/Sunday 21st July 1983. However the 20th and 21st July 1983 fell on Wednesday and Thursday.
Continuity mistake: Early in the movie, we see "Woody" driving a 1969 or 1970 Red Mustang. At the end of the movie, when he is driving his friends over to the mayor's house, he is driving a much older Mustang, either a 1965 or 1966. It is red like the first one, but the car's body style is obviously very different.
Continuity mistake: Rolland Tyler (the set-up special effects guru) and his F/X assistant Andy have one of the "dirty" cops in the truck of an old car. To get a confession out of him, they take him to a secluded place under a highway overpass and continue to ram the car, trunk first, into the overpass pillars with the cop still in the truck. The man buckles, but not before about six rear-end hits. Yet, there is very little dents or damage to the back of the car throughout the ordeal.
Continuity mistake: The film is supposed to take place in 1917, but several of the german soldiers our heroes encounter are armed with Bergman M18 sub-machineguns which didn't appear until a year later. To make things even worse all the guns comes with a magazine-type that didn't appear until the mid-thirties.
Continuity mistake: When Tiger and Fievel are doing their musical piece, Tiger wipes off the mirror and they appear the same size. When he lays out in front of the mirror, singing the line "We'll be there to pick each other off the floor", he places his head next to the cage bottom, still laying on the floor between them. In the mirror, however, that cage bottom is not reflected at all. (00:57:30)
Revealing mistake: The "blower" on the yellow Firebird never runs. NO wonder he couldn't beat the Wraith. (00:44:10)
Continuity mistake: When Jack Burton and the rest of the gang escape from the Wing Kong Trade Centre the first time, the guards fire at the left side of the bus breaking the windows and making holes in the bodywork. When we see the bus a few seconds later as it is driving away, it appears undamaged.
Visible crew/equipment: In the scene where Eddie's mom is telling him to pass out the candy (before she goes to the Halloween party with her boyfriend), you can see a red boom microphone at the top of the screen.
Continuity mistake: Hook's earring appears, when he talks to Crissy by the fridge after her late night out.
Plot hole: Sarah breaks a mirror in frustration by throwing something against it. Then she buries her face in her arms and sobs. It remains a mystery how she managed to cut her hand so bad that it needed to be fixed with five stitches, as she isn't even seen picking up the pieces. (00:59:15)
Revealing mistake: After the bounty hunter, who changes three times throughout the movie, changes into the Reverend, he is in front of someone else who is a stand-in for the real Reverend but is obviously not.
Factual error: Cruise is breaking and if you watch the eight ball after the break it's following the 5 into a pocket at the end of the table closest to Tom. Now the 8 ball didn't necessarily go in because they focus on the one ball, but in the next frame shot, there's no way it could be at the opposite end of the table like they show. (00:29:20)
Continuity mistake: During Kevin Bacon's race with fellow messenger, the scenes shift back and forth from New York to San Francisco. In one city, he's on a fixed gear (no freewheel on back wheel) and when the race is taking place in the other city, he's riding a single-speed. Basically, the cityscape and bicycles switch from scene to scene.
Factual error: The movie they're watching in the theater, "The Fly", is shown backwards. The first scene they see should have happened after the last scene they see.
Continuity mistake: During the very last scene with all of the Freelings, Taylor and Tangina, right after Taylor leaves alone in the Freelings' car and the Freelings start walking down the street, the camera pans back so you can see the whole neighborhood including where they were just standing. Where did Tangina go?
Revealing mistake: At the beginning, when Ivan and the two New York businessmen approach the school, the three are seen through a window from inside the school. If you pay close attention to the reflection of the students in the window, you can see that they are in no way doing anything related to what is being heard inside the school. After the class is dismissed and starts to leave, we see Ivan and the two businessmen begin to enter the school, and if you look in the window, the class is still going hard. (00:03:00)
Continuity mistake: Near the end of the film, as the two women are leaving the house, Leslie Anne Downe is holding a large candle. As they get into the car, she sets the candle on the hood of the car. In the net shot, as they back out of the garage, the candle is gone.
Continuity mistake: The group who set out for Flutter Valley are chased by Ahhg the giant spider after tickling him and slipping away unnoticed. As they make a dash towards a nearby cliff, Gingerbread (white Pony with purple, pink and blue hair) and Baby Lickety Split (light purple with pink hair) have somehow joined the group, but Baby Lickety Split should be with the Grundles and Spike and Gingerbread should be back at Paradise Estate.
Continuity mistake: When Eddie and Michel are in the police station and Losado comes to pick up Michel, her hair clip is on the left side of her hair. After Losado and Michel get into the car, her hair clip moves to the right side.