Moviefone's 16 Sci-Fi Movie Blunders

In the training simulator at the beginning of the film, after Sulu and McCoy have both fallen, McCoy has his head resting on Sulu's hip at first. Then, in the next shot, his head is resting closer to Sulu's knee.

The 1979 Mel Gibson movie featured a scene where Max's wife Jessie (Joanne Samuel) tugs at the back of a chain attached to a car. However, in this shot, you can see a crew member's hand firmly holding onto the chain.

In Ridley Scott's 1979 hit, the search party that goes into the boneship are wearing hoods under their helmets. When Kane's (John Hurt) helmet is cut off, his hood has been removed.

In the 1997 flick, LeeLoo (Milla Jovovich) tries to escape from the science lab, only to be cornered by police on the edge of a building. At one point, the police take a picture of her with a camera that has two separate angles of LeeLoo: a close-up shot and a wide shot. However, as you can see in the screen grab, her facial expressions are completely different when they snap the photo.

During a conversation with Danny Witwer (Colin Farrell) and Director Lamar Burgess (Max von Sydow), Witwer's tie goes from loose to tightly knotted.

Ridley Scott's futuristic noir film may be critically lauded, but even this 1982 number has its flaws: Early in the movie, when Deckard (Harrison Ford) heads to the police station, there are visible cables lifting the car up.

Another Arnie offense: Here, he uses a dead man as a human shield. However, a second later, the supposedly dead guy begins to grimace.

James Cameron may be known as a perfectionist, but he overlooked this detail: The Terminator's (Arnold Schwarzenegger) stolen police motto changes from "To care and protect" to "Dedicated to serve."

In J.J. Abram's 2009 revamp, Kirk (Chris Pine) nearly loses his grip during a fight scene. After Sulu (John Cho) comes to his rescue, Kirk's position has shifted: he is holding on with his left hand and being lifted up by his right.

When David (Jeff Goldblum) and his father (Judd Hirsch) make their way to D.C. during the alien mayhem of 1996's "Independence Day," the door lock on the passenger side switches from the locked to the unlocked position without anyone having touched it.

Just before Neo (Keanu Reeves) opens the door to the Oracle's house, there's a reflection of the camera in the knob. (The clever folks of "The Matrix" tried to obscure the equipment, draping a sheet, which was painted to look like the wall.)

During the chase scene with the Libyans, the odometer on the DeLorean reads 33064.2 and the trip counter says 88.8; the second time we see it, it decreases to 33061.8 and 86.4. A few seconds later, it goes down again from 33,061.8 to 32,994.4, while the trip counter has gone from 86.4 to 19. The instrumentation is also inconsistent: the needle is sometimes angled and other times flat.

In Steven Spielberg's 1993 hit, the Tyrannosaurus Rex drops a bloody goat's leg on the car Lex and Timmy (Ariana Richards, Joseph Mazzello) are riding in. But when the dino turns to attack the kids, the leg has vanished from the top of the car.

During the knife-throwing scene, Ace Levy (Jake Busey) gets stabbed in the hand. But, as you can see, the blood begins to pour before it pierces his skin. (The grey blur in front of Jake is the knife come directly at him.)

When Luke, Han, and C-3PO get snared and surrounded by Ewoks on Endor, the Ewoks mistake C-3PO for a god and start bowing. One Ewok's costume must have been a bit ill-fitting, because the actor's face is clearly visible through the eyes and mouth holes of his furry mask.

When Jedi masters Darth Vader (voiced by James Earl Jones) and Obi-Wan Kenobi (Alec Guinness) square off in George Lucas's 1977 epic,Vader's chestplate switches from scene to scene. (This was likely due to the filmstrip being flipped around during post-production.)