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Honey, I Shrunk the Kids (1989) Poster

Goofs

Audio/visual unsynchronised 

(at around 54 mins) When the ant shows up, and the kids are debating what to do, Russ jumps out from behind the grass and says "I say, that ant is ours"- but his mouth isn't moving.
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Character error 

(at around 54 mins) It is stated that the ant is a baby. All ants that look like ants are adults. Actual baby ants look like maggots.
(at around 31 mins) When getting out of the trash bag, Nick says they are a quarter of an inch tall. That would mean they are bigger than the ant.
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It is established in the film that Russ is not capable of whistling, but when Wayne and Diane Szalinski lean over the grass towards the end of the movie and all of the kids scream, Russ whistles loudly.
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In film Scorpion's size was shown equal to the size of an Ant. This is impossible if compared to real life.
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Continuity 

(at around 47 mins) Amy can be heard breathing when supposedly not breathing after nearly drowning.
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(at around 53 mins) When the kids run and hide from the ant after he takes over their cookie, Amy had no cream filling on her mouth. In the next shot when she is telling Ron to be quiet, there is cream on her bottom lip.
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From the window's side of Russell and Mae's bedroom, their bed is on the left side of their room, but when they are talking about little Russell, the bed is on the right side. Everything in the entire bedroom has switched sides from the first scene when Russell opens up his window to yell at Wayne.
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The kids, when compared to the size of the Lego block, should be larger than the ant.
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(at around 52 mins) When Amy walks over to Ron to offer him a truce, her hands are clean, but then she puts mud in his hand when they shake.
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(at around 46 mins) When Wayne runs to turn off the faucet on the side of the house, a pair of bluejeans is hanging on his left shoulder. In the next shot, the bluejeans are gone.
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After saving Amy from drowning, Russ' white over shirt becomes a muddy brown. But for the duration of the movie, it is just slightly dingy with a lighter shade of brown.
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(at around 28 mins) Wayne takes the kids outside in the garbage bag and puts them outside the fence. When the kids rip the garbage bag (possibly with the screw picked up in the attic) and crawl out, they are inside the yard.
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At different points in the movie, characters are seen popping up in the middle of a Cheerios and riding an ant. However, most common species of North American ant that would be found in your average backyard would fit through a Cheerios with approximately the same amount of extra space as the character shown- even a Carpenter ant would be only moderately larger and would still fit through a Cheerios with room to spare. This would put the characters at about the same size as any given ants, not small enough to ride them.
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The size of the hole in the broken windows.
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(at around 7 mins) The door to the attic is shown swinging wide open, and then immediately after, Nick is showing slowly opening that same door just wide enough for him to slip through.
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The blood stains on some of the shrunken kids' faces changes constantly.
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Crew or equipment visible 

When the kids are riding the ant, two members of the crew can be seen walking in front of them.
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In both Nick and his father's glasses, reflections of set lighting and cameras can be seen throughout the film.
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(at around 39 mins) When Nick and Russ are on the bee, when the bee flies back down and hits the blades of grass, before Nick and Russ fly off a harness can be clearly seen on Nick for a few frames.
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Errors in geography 

Scorpions are usually desert creatures and would be a rare sight in an average family's backyard, especially if the immediate environment is a forest.
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Factual errors 

(at around 21 mins) Szalinkski says that the Shrink Ray works by reducing the empty space in matter. If this is true, then the children's mass and weight would be exactly the same despite the reduced size. The trash bag Scalinkski would weigh several hundred pounds, the ant would not have been able to hold them, and the ground would have been compressing under the children's feet: the small surface area of their feet would mean that they would be exerting many tens of thousands of pounds of force per square inch.
During the scorpion/ant fight the scorpion is seen using his stinger multiple times not even striking the ant but the ground. Scorpions never waste their venom in random situations or even on prey that is smaller than themselves.
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Szalinski says the shrink ray works by removing the space between molecules; however, a solid object has very little space between its molecules making it impossible to shrink as much as they are shrunk.
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Miscellaneous 

Nick's glasses are impractically durable. He has on more than one occasion while shrunk where they could've been broken in any way, shape and form, especially after being flung in the air not once but twice (from being on a runaway Bee and after nearly being chopped to death by a Lawnmower), his glasses would've had some kind of damage on them, like a scratched or cracked lens or warped out of shape.
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Incorrectly regarded as goofs 

(at around 2 mins) At the beginning of the movie, a letter carrier is delivering mail. There is a mailbox with the flag up. He should open it, remove the outgoing mail, put the flag down and deliver incoming mail. However, he just opens the box and delivers the incoming mail, leaving the flag up. While this is true, it is not uncommon for people to forget to raise or lower the flag accordingly.
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Plot holes 

After the kids are shrunk and Szalinski destroys his machine, he thoroughly sweeps the floor of the attic, ridding it of both the broken microchips and the kids. In spite of this, his shrunken thinking couch and chair are still on the attic floor undisturbed an hour or so later.
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When the kids encounter the stream of dog urine, Russ suggests that if they could get some rope they could make a log bridge, only to realise they don't have any logs either; later however, after the scorpion attack, they conveniently have both to erect a fence to keep out any further intruders.
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Szelinsky realizes at the end of the movie that the laser generating heat is what made his machine fail to work the way he wanted it to. But we see at the beginning of the movie that he uses a cold fluid (assumably liquid nitrogen) to try to maintain the heat inside the machine. So he should have known about this already.
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Revealing mistakes 

(at around 27 mins) When the kids are going down the dust-pan, a screw top breaks on the way down, showing it's made of foam.
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Cables visible when Nick is sucked out of the earthworm tunnel.
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In the second shot of the film where a mailman is seen walking and delivering mail for the Thompsons and the Szalinskis, you can clearly see the backlot wall in the background which is painted in blue to stand in for the sky.
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(at around 1h 23 mins) When Nick is in the Cheerios cereal and sees the spoon coming at him, the spoon moves in slow motion and frame by frame, while his dad behind moves at normal speed.
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When Nick and Russ are riding the bee, they are green due to the chroma key compositing effect.
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(at around 1h 24 mins) When Nick is in the spoon, the milk around him turns green.
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(at around 37 mins) When the bee arrives at the flower (where Nick is trapped at), the yellow pollen turns dark pink due to the blue/green screens used in the scene.
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When the kids battle the ant, throughout the scene, there is a black cloth underneath the ant, suggesting the ant is not real but animatronic.
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Trivia | Crazy Credits | Quotes | Alternate Versions | Connections | Soundtracks

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