Goofs

When the sheriff arrives to question Tucker and Dale at the cabin, Tucker's face is still slightly swollen and covered in Mike's blood. When they go in the cabin to check on Allison, Tucker's face and neck are clean and un-swollen. When they go back outside after the sheriff gets hit with the beam, Tucker is bloody and swollen again.

When the one college kid jumps into the wood chipper and gets killed, there is blood everywhere, all over the back of his pants down to his ankles and on his shoes. But later on, when Tucker and Dale are taking what's left of the body out of the wood chipper, there is no blood on the shoes or on the bottom of the pants.

When Dale cuts Tucker down from the tree, Tucker's hands go out wide to his sides. It is clear that he has all ten fingers despite the fact that two fingers are supposed to have been cut off.

When Dale is making breakfast for Allison and putting the bacon on the plate and arranging the flowers in the tin can, the flowers are healthy and freshly cut and standing up straight. But in the next scene when Dale walks through the door to give the tray to Allison, the flowers are all wilted and drooping.

Everything happens in one day, but when Tucker is stung by bees, he has horrible welts on his face and cuts and bruises from everything else. The welts change from scene to scene from the start and quickly disappear. After an hour in, they crash their pick-up into a tree and when Tucker is talking to Dale, his face is clean like nothing ever happened.

Dale says that 'Anthemis nobilis' is the ingredient in chamomile tea that leads to allergic reactions. Anthemis nobilis is in fact a strand of chamomile, meaning that Dale said that chamomile is the ingredient in chamomile tea that causes allergic reactions.

This is not an error since Dale stated earlier that "he's not intelligent; he only remembers what he's been told", and since he's not heard that Anthemis nobilis is a synonym for chamomile, only that it's in the tea, does not make him wrong.

After Tucker has his fingers reattached in the hospital, his fingers are not bandaged. It is also alluded that a different finger than Tucker's might have been attached. Because this finger has a painted red nail and significantly less hair, it is meant to be a joke. Although this is unrealistic, the joke has been lost on some viewers.

(At around 33 mins) Allison's head changes position on the pillow after she is knocked out.

Knocked out is not the same as paralyzed. Movement is possible.

When Tucker prepares the nail gun for Dale to use as a diversion, the air hose falls out just before the shot ends.

When shots are being fired from the sheriff's gun, 10+ shots are fired. The gun is a Colt Python .357 Magnum which only holds six shots.

The newspaper which Allison and Dale read during the movie's finale is dated Tuesday, July 15, 1990. In 1990, July 15 fell on a Sunday.

When Tucker and Dale find the newspaper clippings about various murders, etc., all but the headlines and the first clipping use Greeking. Greeking, in typography, involves inserting nonsense text or, commonly, Greek or Latin text in samples of print to check the layout of the final version before the actual text is available, or to enhance layout assessment by eliminating the distraction of readable text.

After the cabin explodes, Chad's neck is charred but his necklace is perfectly intact. After the explosion, it should have at the very least stuck to his neck or melted.

In the disclaimer at the end, it reads, in part, "are entirelyfictional," when, of course, it should be "are entirely fictional."

When Dale walks over to the teenagers' car, part of the sound crew is visible in a reflection.

In a shot outside of the cabin, you can clearly see the source of the fog machine blowing fog into the air.

The opening shot is labeled 'Appalachian Mountains West Virginia'. However, the trees are all taiga-type conifers. In West Virginia, the trees are mostly temperate hardwoods.

Nearing the midpoint, Tucker & Dale are caught by the sheriff dragging the remains of the college student they have just removed from the woodchipper. But other than warning the other students to stay in the car, he approaches the duo with no more caution than he did when he stopped their car for a faulty turn light. Any police officer, seeing a dismembered body and blood all over two men dragging him would, justifiably, at least draw his weapon and tell them to get on the ground.

Allison seems to take multiple shots to the head throughout the film, but she doesn't seem to even have a concussion, despite common sense say she should. She also doesn't seem to have any ill effects from it. This would be impossible.

When the college kid takes the Sheriff's gun, Dale instructs him to "take off the safety." The revolver is a Colt Python .357 which doesn't have a safety.

Dale tells Chuck to check the safety when Chuck is pointing the police officer's gun at Dale and Tucker. Chuck is holding a revolver that does not have a manual safety lever. It is unlikely that Dale's helpful suggestion was actually a clever ploy to kill the young college kid.