If you’re able to spot continuity errors in movies, you might want to try your hand as an in-the-wild tester. If not, then you can rely on Moviefone.com, who posted a nice mash-up of the worst errors in sci-fi movies. Here were a few of my favorites:

Jurassic Park
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.

Back to the Future
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.

The Matrix
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.)

Independence Day
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.

Star Wars
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.)

Terminator
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.”

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

Blade Runner
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.

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

Alien
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.

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