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 Marty returns to 1985 from 1885 the time machine is destroyed by a train. What is strange is that not only does the train not stop (which is mandatory in the event of an accident) but there is also no reaction from people nearby, such as those in the vehicles waiting to cross the track at the level crossing. Later, when Marty returns to the site with Jennifer, there is still no sign of police officers or other officials.
Other mistake: When Cry-Baby's gang arrives and Uncle Belvedere is taking a bath, Snare-Drum and Suzie Q ask Hatchet to make the monster face and Snare-Drum starts to run, but then he appears on the other side of Suzie Q and runs after her.
Other mistake: When Robert Downey Jr. lowers the helicopter onto the freeway to yell at the truck driver, he is very close to the truck driver, so close that the truck driver can even hit the helicopter. Why does a long haired man standing underneath a helicopter not have his hair blown around?
Other mistake: When Carl has received the Nassau bank account number from the drug dealer on the phone, afterward you see him typing in "Rita Miller" on the computer. If you watch closely, his left hand pinky never touches the "A" key on the keyboard, yet the "A" in Rita comes up just fine and out of sync with the clicking sounds of the keyboard.
Other mistake: Right after Julie is born and they're taking her away, the nurse is opening the door. Then they change over to the mother, then back to the baby, and the nurse is just opening the door again.
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: In the scene at the end of the film where Mr Kimble is being wheeled out on a stretcher his left bicep has a blood-pressure cuff on it, but moments earlier Mrs. Crisp shot him in the left bicep. That would be extremely painful.
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: Irv and Blaire's death scene doesn't make sense. When Irv poured butter on the popcorn, he should've noticed the spider in the bowl. Also, when Blaire picked the spider up, she should've felt it. Both of them still appeared to be watching the TV after being bitten, which also didn't make sense. Why didn't they have seizures like the other victims?
Other mistake: When the bad guy is sliding down the tube and there is a close up of his face, it's constantly lit. There couldn't have been any light in the tube, since it's completely closed.
Other mistake: As the hotel manager is going over table manners with Vivian, when he picks up the salad fork he says salad forks have 3 tines, but when he puts that fork back on the table you can see it has 4.
Other mistake: Near the end of the film, Charlotte and her mother (Mrs. Flax) are having a blazing row. Mrs Flax calls Charlotte 'the town tramp', and Charlotte retaliates by telling her that the town already has one. This results in Charlotte receiving a huge slap. This slap would leave her cheek as red as a tomato, but as the scene continues, there isn't a mark on her face. A tad unrealistic?.
Other mistake: Gizmo can't be exposed to sunlight, yet when the shop is demolished he walks out on the street. Note how he is walking past the shady part of the curb to the sunny part, suffering no harm whatsoever.
Other mistake: Once Earl stops the CAT at Burt and Heather's house, Val is standing on its roof directly above Earl. Val is looking and talking straight at them. The graboids shake the CAT, Earl drives it forward quite a bit (take notice just how far), but he looks up to tell Burt to hurry but he and Val are still facing in the same direction. They should be facing backward due to the distance they had to move up. Also, you'll notice that Burt is right in line with the trailer as he throws most of his gear. (01:14:30 - 01:15:30)
Other mistake: Barney asks the new bride to put Vinnie back on the phone, and she did. At that time she only knew Vinnie as Todd. (01:05:37)
Other mistake: If Burt honestly believes he only has days left to live, wouldn't he be wondering why he isn't displaying any symptoms of illness (coughing, fever, pain etc). Also why wasn't he prescribed any kind of medication by the doctor who gave him this prognosis. Kinda silly really.