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A Sound of Thunder (2005) Poster

Goofs

Jump to: Anachronisms (1)  | Character error (2)  | Continuity (6)  | Factual errors (5)  | Miscellaneous (1)  | Incorrectly regarded as goofs (1)  | Plot holes (5)  | Revealing mistakes (3)  | Spoilers (1)

Anachronisms 

The men go back in time 65 million years, where they are attacked by an Allosaurus. However, Allosaurus lived during the Jurassic Period, which ended 145 million years ago.
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Character error 

After the crew returns from the trip, Ryer talks to Payne about the malfunction. Payne then mentions the Heisenberg Uncertainty Principle and that is says nothing can be certain. Actually, the Heisenberg Uncertainty Principle does not state that "nothing can be certain". It states that the momentum and position of any object cannot both be exactly known. As the precision with which one of these properties is known increases, the precision of the other property decreases. Similarly, with time and energy. This uncertainty in knowing these pairs of values is not due a defect in any instrument; it is a fundamental law of nature.
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Sonia states that humans will be affected last by the time waves because they are the last beings to evolve. The most basic understanding of evolutionary theory suggests that all living things evolve continuously, so humans cannot by any means be called the beings to have evolved most recently.
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Continuity 

When observing the Lion hologram Travis explains to Sonia that all animals - both in the wild and captivity - are now extinct due to poaching and an unspecified virus, with no DNA available for cloning purposes. However, in the following scene one client (Christian Middleton) asks the other, "What was the last really exciting thing you did? Play fetch with your dog?"
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When Travis is walking along the street with Jen, the traffic is zipping by to the left of them, but a close up on Travis shows no traffic activity in the glass of the building next to them.
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Although client Christian Middleton's boot bottom is discovered to have a sizable portion of a large trampled "butterfly" (actually a moth) still attached, the muddy boot print from earlier in the film is almost entirely complete with no indication of disruption from an insect of that magnitude.
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The name on the back of Travis Ryer's helmet changes from saying "Ryer" to "Travis" and back again, through various scenes. In the short story, the protagonist's last name was Travis.
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Sonya has blood on her left cheek while talking with Travis on the sidewalk. It's gone when they cross the street to the median but it returns when they get to the Zoo.
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Sonia explains how ripples in time prevented Travis from traveling back further by drawing a series of holographic ripples and pulling them towards the center on one side. During one shot, the ripples are suddenly all outward again, then pulled inwards again during the next shot.
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Factual errors 

The insect that Middleton stepped on was a moth (Io Moth - Automeris io), not a butterfly as described. The insect on the movie's cover art is also a moth, a Black Witch (Ascalapha odorata).
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The very area they are hunting in was about to be completely swept away by a Pyroclastic flow which would have killed every living thing in the area and reduced the moth that was stepped on into ash, so how could it possibly effect the time-stream at all?
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The behaviour of the water during the tunnel sequence is incorrect. The bubbles against the train windows could not happen as the windows were angled upwards which means the bubbles would rise straight up, not flow against the windows. Also the way the water flows into the train after the water creature breaks the window is shown, after the initial flow, as a high pressure spray rather the steady flow it would have been.
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Travis floats out of the train window, even though there would be insufficient current to cause him to come out of the open pane.
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Any interference with the evolutionary time line the travelers made during the age of the dinosaurs would have been greatly impacted by the mass extinction of the dinosaurs around 65 million years ago. However, no mention is made in the movie of the effect the mass extinction could have had on ripple effect caused by the killing of the butterfly.
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Miscellaneous 

When the main characters step out of the building and you see the "futuristic" traffic for the first time in the background, it is a loop and you see the same three vehicles pass by twice.
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Incorrectly regarded as goofs 

While one might expect that each group jumping to the same moment in the past (5 minutes before the volcano erupts) would in turn encounter all those from previous trips as well, adherence to such a claim would render the concept of time vacations completely unfeasible, and thus the film maker's decision to disregard this bit of logic is crucial to the film's coherency. This being said, Travis is only ever able to see himself and others by worm-holing to a point one year before the disturbance occurred and then slingshotting forward in time, not backward.
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Plot holes 

The film is excessively loose with its requirements for what constitutes a time altering event. For instance, any sound made by bullets fired, voices, footsteps, etc. would cause surrounding wildlife to react in a manner drastically different than if the alien noises had never been created. Furthermore, the presence of both the temporal pathway and the people walking upon it would divert wildlife from what would have been their original movements, causing drastically different outcomes for said creatures.
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After Sonia asks Travis if it had been 24 hours since his last jump and he replies yes, she proceeds to wipe a window clean to show him that she had predicted the occurrence of a time wave. There is no basis for her 24 hour time period provided within the film, and other waves occur upon notably shorter intervals.
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With a lack of explaining any kind of multiverse reality, how are different hunting parties able to jump to the same exact time in the past without running into prior hunting parties. They don't explain how they avoid this paradox.
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They have the ability to time travel? So just go back a few days to when the expedition that messed everything up is being planned and tell them not to go.
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The Allosaurus never alters its attack plan and movements (as displayed when Travis taunts the Allosaurus by exactly predicting its movements), regardless of such factors as hunting group size, conversation/noise, position upon the path, and individual actions.
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Revealing mistakes 

Although the Allosaurus can clearly see the hunters, when Travis accidentally travels to the desert the Native Americans and their horses have no discernible reaction to either his presence or the presence of the temporal path before them.
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When Dr. Rand and Travis jump out of the observatory window into the tree, the branches that "broke" off have been cut off with a saw. Not broken.
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When the (computer-generated) eel-creature is first seen swimming along the surface of the water in the flooded subway tunnel, it doesn't create the slightest ripple or wave, indicating that the film makers did not take into account its interaction with the environment when they added it to the scene.
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Spoilers

The goof item below may give away important plot points.

Factual errors 

The water creature suddenly bobs to the surface after Travis is rescued, despite the fact (a) there is insufficient current to move the creature and (b) the creature was crushed to death by the tunnel roof collapse which crushed the train.
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See also

Trivia | Crazy Credits | Quotes | Alternate Versions | Connections | Soundtracks

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